revert(3p/git): Revert merge of git upstream at v2.26.2

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232, reversing
changes made to f2b211131f.

third_party/git/Documentation/config/push.txt

@@ -1,7 +1,6 @@
 push.default::
 	Defines the action `git push` should take if no refspec is
-	given (whether from the command-line, config, or elsewhere).
-	Different values are well-suited for
+	explicitly given.  Different values are well-suited for
 	specific workflows; for instance, in a purely central workflow
 	(i.e. the fetch source is equal to the push destination),
 	`upstream` is probably what you want.  Possible values are:
@@ -9,7 +8,7 @@ push.default::
 --
 
 * `nothing` - do not push anything (error out) unless a refspec is
-  given. This is primarily meant for people who want to
+  explicitly given. This is primarily meant for people who want to
   avoid mistakes by always being explicit.
 
 * `current` - push the current branch to update a branch with the same
@@ -80,7 +79,7 @@ higher priority configuration file (e.g. `.git/config` in a
 repository) to clear the values inherited from a lower priority
 configuration files (e.g. `$HOME/.gitconfig`).
 +
-----
+--
 
 Example:
 
@@ -97,7 +96,7 @@ repo/.git/config
 
 This will result in only b (a and c are cleared).
 
-----
+--
 
 push.recurseSubmodules::
 	Make sure all submodule commits used by the revisions to be pushed