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-feature.rst

@@ -28,7 +28,7 @@ DESCRIPTION
 ===========
 	**bpftool feature probe** [**kernel**] [**full**] [**macros** [**prefix** *PREFIX*]]
 		  Probe the running kernel and dump a number of eBPF-related
-		  parameters, such as availability of the **bpf()** system call,
+		  parameters, such as availability of the **bpf**\ () system call,
 		  JIT status, eBPF program types availability, eBPF helper
 		  functions availability, and more.
 
@@ -93,9 +93,13 @@ SEE ALSO
 	**bpf**\ (2),
 	**bpf-helpers**\ (7),
 	**bpftool**\ (8),
-	**bpftool-prog**\ (8),
-	**bpftool-map**\ (8),
+	**bpftool-btf**\ (8),
 	**bpftool-cgroup**\ (8),
+	**bpftool-gen**\ (8),
+	**bpftool-iter**\ (8),
+	**bpftool-link**\ (8),
+	**bpftool-map**\ (8),
 	**bpftool-net**\ (8),
 	**bpftool-perf**\ (8),
-	**bpftool-btf**\ (8)
+	**bpftool-prog**\ (8),
+	**bpftool-struct_ops**\ (8)