v.overlay manual: fix typo (fixes trac https://trac.osgeo.org/grass/ticket/2222)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@59271 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.overlay/v.overlay.html

@@ -3,7 +3,7 @@
 <em>v.overlay</em> allows the user to overlay two vector maps. Features 
 in <b>ainput</b> can be lines or areas and are cut with areas in 
 <b>binput</b>. Simple <i>clipping</i> can be performed with the <b>and</b> 
-oerator.
+operator.
 <p>
 If areas in <b>ainput</b> are overlaid with areas in <b>binput</b>, 
 it is sometimes necessary to snap areas of <b>binput</b> to those of