docs: move signature docs to man section 5

Continue the move of existing Documentation/technical/* protocol and
file-format documentation into our main documentation space by moving
the signature format documentation.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/Makefile

@@ -27,6 +27,7 @@ MAN5_TXT += gitattributes.txt
 MAN5_TXT += gitformat-bundle.txt
 MAN5_TXT += gitformat-commit-graph.txt
 MAN5_TXT += gitformat-index.txt
+MAN5_TXT += gitformat-signature.txt
 MAN5_TXT += githooks.txt
 MAN5_TXT += gitignore.txt
 MAN5_TXT += gitmailmap.txt
@@ -115,7 +116,6 @@ TECH_DOCS += technical/racy-git
 TECH_DOCS += technical/reftable
 TECH_DOCS += technical/send-pack-pipeline
 TECH_DOCS += technical/shallow
-TECH_DOCS += technical/signature-format
 TECH_DOCS += technical/trivial-merge
 SP_ARTICLES += $(TECH_DOCS)
 SP_ARTICLES += technical/api-index

Documentation/gitformat-signature.txt

@@ -1,7 +1,18 @@
-Git signature format
-====================
+gitformat-signature(5)
+======================
 
-== Overview
+NAME
+----
+gitformat-signature - Git cryptographic signature formats
+
+SYNOPSIS
+--------
+[verse]
+<[tag|commit] object header(s)>
+<over-the-wire protocol>
+
+DESCRIPTION
+-----------
 
 Git uses cryptographic signatures in various places, currently objects (tags,
 commits, mergetags) and transactions (pushes). In every case, the command which
@@ -200,3 +211,7 @@ Date:   Wed Jun 15 09:13:29 2016 +0000
     # gpg:          There is no indication that the signature belongs to the owner.
     # Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA  29A4 6109 2E85 B722 7189
 ----
+
+GIT
+---
+Part of the linkgit:git[1] suite

command-list.txt

@@ -212,6 +212,7 @@ gitfaq                                  guide
 gitformat-bundle                        developerinterfaces
 gitformat-commit-graph                  developerinterfaces
 gitformat-index                         developerinterfaces
+gitformat-signature                     developerinterfaces
 gitglossary                             guide
 githooks                                userinterfaces
 gitignore                               userinterfaces