tools, bpftool: Minor fixes for documentation

Bring minor improvements to bpftool documentation. Fix or harmonise
formatting, update map types (including in interactive help), improve
description for "map create", fix a build warning due to a missing line
after the double-colon for the "bpftool prog profile" example,
complete/harmonise/sort the list of related bpftool man pages in
footers.

v2:
- Remove (instead of changing) mark-up on "value" in bpftool-map.rst,
  when it does not refer to something passed on the command line.
- Fix an additional typo ("hexadeximal") in the same file.

Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200511161536.29853-3-quentin@isovalent.com

tools/bpf/bpftool/Documentation/bpftool-perf.rst

@@ -20,7 +20,7 @@ SYNOPSIS
 PERF COMMANDS
 =============
 
-|	**bpftool** **perf { show | list }**
+|	**bpftool** **perf** { **show** | **list** }
 |	**bpftool** **perf help**
 
 DESCRIPTION
@@ -85,9 +85,13 @@ SEE ALSO
 	**bpf**\ (2),
 	**bpf-helpers**\ (7),
 	**bpftool**\ (8),
-	**bpftool-prog**\ (8),
-	**bpftool-map**\ (8),
+	**bpftool-btf**\ (8),
 	**bpftool-cgroup**\ (8),
 	**bpftool-feature**\ (8),
+	**bpftool-gen**\ (8),
+	**bpftool-iter**\ (8),
+	**bpftool-link**\ (8),
+	**bpftool-map**\ (8),
 	**bpftool-net**\ (8),
-	**bpftool-btf**\ (8)
+	**bpftool-prog**\ (8),
+	**bpftool-struct_ops**\ (8)