Fixes [YOCTO #10995]
For the dev-manual, I added a new section on incrementing package
revision numbers that explains how the build system uses various
variables to create linearly numbered revisions for packages.
For the ref-manual, I cross-referenced into the new section from the
AUTOSRC and SRCREV variables.
(From yocto-docs rev: 53c3092e0f0293f4db0a88659abb4cf1c93f208c)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>