manual: fix wrong input param in examples (#199)

vector/v.net/v.net.html

@@ -39,7 +39,7 @@ the <em>connect</em> operation, some lines will share the same
 category. In order to assign unique costs to each line, a new layer 
 needs to be created with<br>
 <!-- like this it is rather useless, still to be improved (eg as a full example below!) -->
-<tt>v.category map=yourmap option=add cat=1 step=1 layer=3 output=newmap</tt><br>
+<tt>v.category input=yourmap option=add cat=1 step=1 layer=3 output=newmap</tt><br>
 followed by<br>
 <tt>v.db.addtable map=newmap layer=3 table=tablename</tt>.</li>
 

vector/v.to.points/v.to.points.html

@@ -103,7 +103,7 @@ sample dataset is used to create points along the input lines:
 v.to.points input=railroads output=railroads_points dmax=200
 
 # verify the two layers in the resulting map
-v.category map=railroads_points option=report
+v.category input=railroads_points option=report
 
 # vector info
 v.info map=railroads_points