Merge branch 'ah/doc-submodule-ignore-submodules'

Docfix.

* ah/doc-submodule-ignore-submodules:
  doc: fix reference to --ignore-submodules

Author: gitster

Documentation/gitmodules.txt

@@ -90,7 +90,7 @@ of the superproject, the setting there will override the one found in
 .gitmodules.
 
 Both settings can be overridden on the command line by using the
-"--ignore-submodule" option. The 'git submodule' commands are not
+"--ignore-submodules" option. The 'git submodule' commands are not
 affected by this setting.
 --