fix typo

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@61435 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.out.ascii/v.out.ascii.html

@@ -13,7 +13,7 @@ to standard output.
 The <em><a href="v.in.ascii.html">v.in.ascii</a></em> module performs
 the function of <em>v.out.ascii</em> in reverse; i.e. it converts
 vector maps in ASCII format to their binary format. These two
-companion module are useful both for importing and exporting vector
+companion modules are useful both for importing and exporting vector
 maps between GRASS and other software, and for transferring data
 between machines.