d.linegraph manual: language fixes

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@69648 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.linegraph/d.linegraph.html

@@ -1,6 +1,6 @@
 <h2>DESCRIPTION</h2>
 
-<em>d.linegraph</em> is a primitive program to draw simple x,y line graphs
+<em>d.linegraph</em> is a module to draw simple x,y line graphs
 (plots) based on numerical data contained in separate files.
 
 
@@ -22,12 +22,11 @@ deceptive.
 
 <h3>File inputs</h3>
 
-<p>
-If <b>directory</b> option is provided, the paths to files can (and
-should) be only relative paths to the files. This is not recommended
-for scripting, but it can be advantageous when typing the paths
-manually. For example when all the files are stored in the directory
-<tt>/home/john/data</tt>, use can provide the following in the command
+If the <b>directory</b> option is provided, the paths to files can (and
+should) be only relative paths to these files. WHile this is not recommended
+for scripting, it can be advantageous when typing the paths
+manually. For example when all files are stored in the directory
+<tt>/home/john/data</tt>, the user can provide the following in the command
 line:
 
 <div class="code"><pre>
@@ -37,35 +36,35 @@ d.linegraph directory=/home/john/data x_file=x.txt y_file=y1.txt,y2.txt
 
 <h3>Managing colors</h3>
 
-User can specify the <b>y_color</b> option, the <b>color_table</b>
+The user can specify the <b>y_color</b> option, the <b>color_table</b>
 option or just leave the defaults to influence the color of the
 plotted lines.
 
 <p>
-Color specified by <b>y_color</b> option is used for drawing the lines
+Colors specified by <b>y_color</b> option are used for drawing the lines
 in the graph. If multiple Y data files are used, an equal number of
 colors may be used to control the colors of the lines. Colors will be
 assigned to Y data in respect to the sequence of instantiation on the
 command line. It can be one of GRASS GIS named colors or the RGB
-values from 0-255 separated by colon.
+values from 0-255 separated by colons (RRR:GGG:BBB).
 
 <p>
-Alternatively, user can use <b>color_table</b> option to specify one
+Alternatively, the user can use the <b>color_table</b> option to specify one
 of the GRASS GIS predefined color tables.
 
 <p>
-By default, a series of colors will be chosen by the program if none are
-provided upon invocation. Order of default colors is red, green,
-violet, blue, orange, gray, brown, magenta, white, and indigo. User is
-advised not to rely on the order of default colors and use <b>y_color</b>
-or <b>color_table</b> option to obtain predictable and reproducible
-results.
+By default, a series of colors will be chosen by the module if none are
+provided upon invocation. The order of default colors is red, green,
+violet, blue, orange, gray, brown, magenta, white, and indigo. The user is
+advised not to rely on the order of default colors but to either use the
+<b>y_color</b> or the <b>color_table</b> option to obtain predictable and
+reproducible results.
 
 <p>
 The color to be used for titles, axis lines, tics, and scale numbers
-is determined by the <b>title_color</b> option.
-User can provide one of the GRASS GIS named colors (such as gray, white, or black)
-or use the GRASS GIS colon-separated format for RGB.
+is determined by the <b>title_color</b> option. The user can provide
+one of the GRASS GIS named colors (such as gray, white, or black)
+or use the GRASS GIS colon-separated format for RGB (RRR:GGG:BBB).
 
 <h3>Titles, labels, and tics</h3>
 
@@ -90,24 +89,27 @@ placement using the <em><a href="d.text.html">d.text</a></em> or
 
 For historical reasons, the <em>d.linegraph</em> module accepts
 titles of more than one word where the underscore character ("_")
-is used to represent spaces (" "). For example "Census_data_1990"
-would be printed over the graph as "Census data 1990". This is not
+is used to represent spaces (" "). For example "Census_data_1990" would be
+printed over the graph as "Census data 1990". The use of underscores is not
 necessary to use as long as the parameter is quoted in the command line.
-In general, this is not recommended to use and there is no need to use
-it at all in Python or GUI.
+In general, use of underscores is not recommended and there is no need to use
+it at all in the GUI or when using <em>d.linegraph</em> in Python scripts.
 
 <p>
-The way the program locates and labels tic marks is less than perfect: 1)
-although distances between Y tics is proportional to the value, they are
-not proportional on the X axis; 2) decimal values between -1 and 1 can be
-printed on the X axis, but not on Y. (With respect to the later, the input
-for Y values can all be multiplied by a factor of 10 before graphing).
+The way the program locates and labels tic marks is less than perfect:
+<br>
+1) although distances between Y tics is proportional to the value, they are
+not proportional on the X axis;
+<br>
+2) decimal values between -1 and 1 can be printed on the X axis, but not
+on Y. (With respect to the later, the input for Y values can all be
+multiplied by a factor of 10 before graphing).
 
 <p>
-Depending on the user needs, it might be easier or more appropriate
+Depending on the user's needs, it might be easier or more appropriate
 to use a 3rd party tool such as xgraph, gnuplot, Matplotlib in Python,
 or R instead of <em>d.linegraph</em>.
-For a more general solution for plotting in GRASS GIS, user is
+For a more general solution for plotting in GRASS GIS, the user is
 advised to use the <em><a href="d.graph.html">d.graph</a></em> module.
 
 
@@ -147,8 +149,9 @@ d.mon start=cairo output=plot.png width=400 height=400 --o
 d.erase  # previous image is not cleaned
 -->
 
-The series of commands creates a file <tt>plot.png</tt> in the current
-directory which is the drawing make by <em>d.linegraph</em>.
+<p>
+The next command sequence creates a file <tt>plot.png</tt> in the current
+directory which is the drawing made by <em>d.linegraph</em>.
 
 <div class="code"><pre>
 d.mon start=cairo output=plot.png width=400 height=400