doc: Remove extra space (#5059)

There is only one trailing space in all HTML files, but there is one. This change removes it.

Author: wenzeslaus

raster/r.geomorphon/r.geomorphon.html

@@ -34,7 +34,7 @@ <h3>What is geomorphon:</h3>
 LOS only, does not detect positive forms correctly.
 
 <p> There are 3**8 = 6561 possible ternary patterns (8-tuples). By removing
-all patterns that are the result of either rotation or reflection of other 
+all patterns that are the result of either rotation or reflection of other
 patterns, a set of 498 patterns remains, referred to as geomorphons.
 This is a comprehensive and exhaustive set of idealized landforms that are
 independent of the size, relief, and orientation of the actual landform.