Merge topic 'Help-add_custom_command-grammo' into release-3.29

b03356f954 Help/add_custom_command: fix verb grammo

Acked-by: Kitware Robot <[email protected]>
Merge-request: !9297

Help/command/add_custom_command.rst

@@ -549,7 +549,7 @@ one of the keywords to make clear the behavior they expect.
   lines or custom commands will be omitted for the specific
   configuration and no "empty-string-command" will be added.
 
-  This allows to add individual build events for every configuration.
+  This allows adding individual build events for every configuration.
 
 .. versionadded:: 3.21
   Support for target-dependent generator expressions.