merge(3p/git): Merge git upstream at v2.26.2 r/808

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diff --git a/third_party/git/Documentation/technical/api-revision-walking.txt b/third_party/git/Documentation/technical/api-revision-walking.txt
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-revision walking API
-====================
-
-The revision walking API offers functions to build a list of revisions
-and then iterate over that list.
-
-Calling sequence
-----------------
-
-The walking API has a given calling sequence: first you need to
-initialize a rev_info structure, then add revisions to control what kind
-of revision list do you want to get, finally you can iterate over the
-revision list.
-
-Functions
----------
-
-`repo_init_revisions`::
-
-	Initialize a rev_info structure with default values. The third
-	parameter may be NULL or can be prefix path, and then the `.prefix`
-	variable will be set to it. This is typically the first function you
-	want to call when you want to deal with a revision list. After calling
-	this function, you are free to customize options, like set
-	`.ignore_merges` to 0 if you don't want to ignore merges, and so on. See
-	`revision.h` for a complete list of available options.
-
-`add_pending_object`::
-
-	This function can be used if you want to add commit objects as revision
-	information. You can use the `UNINTERESTING` object flag to indicate if
-	you want to include or exclude the given commit (and commits reachable
-	from the given commit) from the revision list.
-+
-NOTE: If you have the commits as a string list then you probably want to
-use setup_revisions(), instead of parsing each string and using this
-function.
-
-`setup_revisions`::
-
-	Parse revision information, filling in the `rev_info` structure, and
-	removing the used arguments from the argument list. Returns the number
-	of arguments left that weren't recognized, which are also moved to the
-	head of the argument list. The last parameter is used in case no
-	parameter given by the first two arguments.
-
-`prepare_revision_walk`::
-
-	Prepares the rev_info structure for a walk. You should check if it
-	returns any error (non-zero return code) and if it does not, you can
-	start using get_revision() to do the iteration.
-
-`get_revision`::
-
-	Takes a pointer to a `rev_info` structure and iterates over it,
-	returning a `struct commit *` each time you call it. The end of the
-	revision list is indicated by returning a NULL pointer.
-
-`reset_revision_walk`::
-
-	Reset the flags used by the revision walking api. You can use
-	this to do multiple sequential revision walks.
-
-Data structures
----------------
-
-Talk about <revision.h>, things like:
-
-* two diff_options, one for path limiting, another for output;
-* remaining functions;
-
-(Linus, JC, Dscho)