Documentation/config: fix typos

Fix typos in documentation.

Signed-off-by: Andrew Kreimer <algonell@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: algonell

Documentation/config/extensions.txt

@@ -9,7 +9,7 @@ work and will produce hard-to-diagnose issues.
 
 extensions.compatObjectFormat::
 
-	Specify a compatitbility hash algorithm to use.  The acceptable values
+	Specify a compatibility hash algorithm to use.  The acceptable values
 	are `sha1` and `sha256`.  The value specified must be different from the
 	value of extensions.objectFormat.  This allows client level
 	interoperability between git repositories whose objectFormat matches

Documentation/config/gc.txt

@@ -163,7 +163,7 @@ gc.repackFilterTo::
 	containing the filtered out objects. **WARNING:** The
 	specified location should be accessible, using for example the
 	Git alternates mechanism, otherwise the repo could be
-	considered corrupt by Git as it migh not be able to access the
+	considered corrupt by Git as it might not be able to access the
 	objects in that packfile. See the `--filter-to=<dir>` option
 	of linkgit:git-repack[1] and the `objects/info/alternates`
 	section of linkgit:gitrepository-layout[5].

Documentation/config/remote.txt

@@ -50,7 +50,7 @@ remote.<name>.skipFetchAll::
 	If true, this remote will be skipped when updating
 	using linkgit:git-fetch[1], the `update` subcommand of
 	linkgit:git-remote[1], and ignored by the prefetch task
-	of `git maitenance`.
+	of `git maintenance`.
 
 remote.<name>.receivepack::
 	The default program to execute on the remote side when pushing.  See