m.proj manual: input=- is needed (while it should be default like in G6?)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@60782 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/m.proj/m.proj.html

@@ -87,7 +87,7 @@ v.out.ascii bugsites | m.proj -o
 To convert a WGS84 long/lat coordinate to the current map projection
 using the <b>-i</b> flag to set projection parameters automatically:
 <div class="code"><pre>
-GRASS> echo "170.510125 -45.868537" | m.proj -i
+GRASS> echo "170.510125 -45.868537" | m.proj -i input=-
 2316541.70      5479193.51 1.23
 </pre></div>