Merge branch 'jk/check-docs-update'

Simplify "make check-docs" implementation and update its coverage.

* jk/check-docs-update:
  check-docs: get documented command list from Makefile
  check-docs: drop git-help special-case
  check-docs: list git-gui as a command
  check-docs: factor out command-list
  command-list: mention git-credential-* helpers
  command-list: add git-sh-i18n
  check-docs: update non-command documentation list
  check-docs: mention gitweb specially

Documentation/Makefile

@@ -344,4 +344,7 @@ require-htmlrepo::
 quick-install-html: require-htmlrepo
 	'$(SHELL_PATH_SQ)' ./install-doc-quick.sh $(HTML_REPO) $(DESTDIR)$(htmldir)
 
+print-man1:
+	@for i in $(MAN1_TXT); do echo $$i; done
+
 .PHONY: FORCE

Documentation/git-credential-cache--daemon.txt

@@ -3,7 +3,7 @@ git-credential-cache--daemon(1)
 
 NAME
 ----
-git-credential-cache--daemon - temporarily store user credentials in memory
+git-credential-cache--daemon - Temporarily store user credentials in memory
 
 SYNOPSIS
 --------

Documentation/git-credential-cache.txt

@@ -3,7 +3,7 @@ git-credential-cache(1)
 
 NAME
 ----
-git-credential-cache - helper to temporarily store passwords in memory
+git-credential-cache - Helper to temporarily store passwords in memory
 
 SYNOPSIS
 --------

Documentation/git-credential-store.txt

@@ -3,7 +3,7 @@ git-credential-store(1)
 
 NAME
 ----
-git-credential-store - helper to store credentials on disk
+git-credential-store - Helper to store credentials on disk
 
 SYNOPSIS
 --------