Merge branch 'convert-doc-to-rst'

Jesper Dangaard Brouer says:

====================
The kernel is moving files under Documentation to use the RST
(reStructuredText) format and Sphinx [1].  This patchset converts the
files under Documentation/bpf/ into RST format.  The Sphinx
integration is left as followup work.

[1] https://www.kernel.org/doc/html/latest/doc-guide/sphinx.html

This patchset have been uploaded as branch bpf_doc10 on github[2], so
reviewers can see how GitHub renders this.

[2] https://github.com/netoptimizer/linux/tree/bpf_doc10/Documentation/bpf
====================

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>