Fix typos

Author: dundargoc

runtime/doc/pi_netrw.txt

@@ -4311,7 +4311,7 @@ netrw:
 				  /cygdrive prefix be a user-alterable
 				  parameter.
 		Jan 02, 2014	* Fixed a problem with netrw-based ballon
-				  evaluation (ie. netrw#NetrwBaloonHelp()
+				  evaluation (ie. netrw#NetrwBalloonHelp()
 				  not having been loaded error messages)
 		Jan 03, 2014	* Fixed a problem with tree listings
 				* New command installed: |:Ntree|