Merge branch 'hw/doc-in-header'

* hw/doc-in-header:
  trace2: move doc to trace2.h
  submodule-config: move doc to submodule-config.h
  tree-walk: move doc to tree-walk.h
  trace: move doc to trace.h
  run-command: move doc to run-command.h
  parse-options: add link to doc file in parse-options.h
  credential: move doc to credential.h
  argv-array: move doc to argv-array.h
  cache: move doc to cache.h
  sigchain: move doc to sigchain.h
  pathspec: move doc to pathspec.h
  revision: move doc to revision.h
  attr: move doc to attr.h
  refs: move doc to refs.h
  remote: move doc to remote.h and refspec.h
  sha1-array: move doc to sha1-array.h
  merge: move doc to ll-merge.h
  graph: move doc to graph.h and graph.c
  dir: move doc to dir.h
  diff: move doc to diff.h and diffcore.h

Author: gitster

Documentation/MyFirstObjectWalk.txt

@@ -17,7 +17,7 @@ revision walk is used for operations like `git log`.
 
 - `Documentation/user-manual.txt` under "Hacking Git" contains some coverage of
   the revision walker in its various incarnations.
-- `Documentation/technical/api-revision-walking.txt`
+- `revision.h`
 - https://eagain.net/articles/git-for-computer-scientists/[Git for Computer Scientists]
   gives a good overview of the types of objects in Git and what your object
   walk is really describing.
@@ -119,9 +119,8 @@ parameters provided by the user over the CLI.
 
 `nr` represents the number of `rev_cmdline_entry` present in the array.
 
-`alloc` is used by the `ALLOC_GROW` macro. Check
-`Documentation/technical/api-allocation-growing.txt` - this variable is used to
-track the allocated size of the list.
+`alloc` is used by the `ALLOC_GROW` macro. Check `cache.h` - this variable is
+used to track the allocated size of the list.
 
 Per entry, we find:
 

Documentation/git-credential.txt

@@ -19,8 +19,7 @@ from system-specific helpers, as well as prompting the user for
 usernames and passwords. The git-credential command exposes this
 interface to scripts which may want to retrieve, store, or prompt for
 credentials in the same manner as Git. The design of this scriptable
-interface models the internal C API; see
-link:technical/api-credentials.html[the Git credential API] for more
+interface models the internal C API; see credential.h for more
 background on the concepts.
 
 git-credential takes an "action" option on the command-line (one of

Documentation/gitcredentials.txt

@@ -186,8 +186,7 @@ CUSTOM HELPERS
 --------------
 
 You can write your own custom helpers to interface with any system in
-which you keep credentials. See the documentation for Git's
-link:technical/api-credentials.html[credentials API] for details.
+which you keep credentials. See credential.h for details.
 
 GIT
 ---