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/git-checkout.txt

@@ -12,14 +12,14 @@ SYNOPSIS
 'git checkout' [-q] [-f] [-m] --detach [<branch>]
 'git checkout' [-q] [-f] [-m] [--detach] <commit>
 'git checkout' [-q] [-f] [-m] [[-b|-B|--orphan] <new_branch>] [<start_point>]
-'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <pathspec>...
-'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] --pathspec-from-file=<file> [--pathspec-file-nul]
-'git checkout' (-p|--patch) [<tree-ish>] [--] [<pathspec>...]
+'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <paths>...
+'git checkout' [<tree-ish>] [--] <pathspec>...
+'git checkout' (-p|--patch) [<tree-ish>] [--] [<paths>...]
 
 DESCRIPTION
 -----------
 Updates files in the working tree to match the version in the index
-or the specified tree.  If no pathspec was given, 'git checkout' will
+or the specified tree.  If no paths are given, 'git checkout' will
 also update `HEAD` to set the specified branch as the current
 branch.
 
@@ -79,14 +79,13 @@ be used to detach `HEAD` at the tip of the branch (`git checkout
 +
 Omitting `<branch>` detaches `HEAD` at the tip of the current branch.
 
-'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <pathspec>...::
-'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] --pathspec-from-file=<file> [--pathspec-file-nul]::
+'git checkout' [<tree-ish>] [--] <pathspec>...::
 
-	Overwrite the contents of the files that match the pathspec.
-	When the `<tree-ish>` (most often a commit) is not given,
-	overwrite working tree with the contents in the index.
-	When the `<tree-ish>` is given, overwrite both the index and
-	the working tree with the contents at the `<tree-ish>`.
+	Overwrite paths in the working tree by replacing with the
+	contents in the index or in the `<tree-ish>` (most often a
+	commit).  When a `<tree-ish>` is given, the paths that
+	match the `<pathspec>` are updated both in the index and in
+	the working tree.
 +
 The index may contain unmerged entries because of a previous failed merge.
 By default, if you try to check out such an entry from the index, the
@@ -97,10 +96,12 @@ using `--ours` or `--theirs`.  With `-m`, changes made to the working tree
 file can be discarded to re-create the original conflicted merge result.
 
 'git checkout' (-p|--patch) [<tree-ish>] [--] [<pathspec>...]::
-	This is similar to the previous mode, but lets you use the
-	interactive interface to show the "diff" output and choose which
-	hunks to use in the result.  See below for the description of
-	`--patch` option.
+	This is similar to the "check out paths to the working tree
+	from either the index or from a tree-ish" mode described
+	above, but lets you use the interactive interface to show
+	the "diff" output and choose which hunks to use in the
+	result.  See below for the description of `--patch` option.
+
 
 OPTIONS
 -------
@@ -308,19 +309,6 @@ Note that this option uses the no overlay mode by default (see also
 	working tree, but not in `<tree-ish>` are removed, to make them
 	match `<tree-ish>` exactly.
 
---pathspec-from-file=<file>::
-	Pathspec is passed in `<file>` instead of commandline args. If
-	`<file>` is exactly `-` then standard input is used. Pathspec
-	elements are separated by LF or CR/LF. Pathspec elements can be
-	quoted as explained for the configuration variable `core.quotePath`
-	(see linkgit:git-config[1]). See also `--pathspec-file-nul` and
-	global `--literal-pathspecs`.
-
---pathspec-file-nul::
-	Only meaningful with `--pathspec-from-file`. Pathspec elements are
-	separated with NUL character and all other characters are taken
-	literally (including newlines and quotes).
-
 <branch>::
 	Branch to checkout; if it refers to a branch (i.e., a name that,
 	when prepended with "refs/heads/", is a valid ref), then that
@@ -351,13 +339,7 @@ leave out at most one of `A` and `B`, in which case it defaults to `HEAD`.
 	Tree to checkout from (when paths are given). If not specified,
 	the index will be used.
 
-\--::
-	Do not interpret any more arguments as options.
 
-<pathspec>...::
-	Limits the paths affected by the operation.
-+
-For more details, see the 'pathspec' entry in linkgit:gitglossary[7].
 
 DETACHED HEAD
 -------------