manuals: fix name capitalization issues

- Using "BitBake" instead of "Bitbake" or "bitbake", aligning with the
  title of the "BitBake User Manual".
- Using "OpenEmbedded" instead of "Openembedded"
- Using "Python" instead of "python"

(From yocto-docs rev: 0b893e2a15aefedd7100445fc9d7eeed07b6afc6)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/migration-guides/migration-3.2.rst

@@ -86,7 +86,7 @@ value to be explicitly prepended to package names being added as
 dependencies (e.g. in :term:`RDEPENDS` and :term:`RRECOMMENDS` values)
 where the dependency is conditionally added.
 
-If you have anonymous python or in-line python conditionally adding
+If you have anonymous Python or in-line Python conditionally adding
 dependencies in your custom recipes, and you intend for those recipes to
 work with multilib, then you will need to ensure that ``${MLPREFIX}``
 is prefixed on the package names in the dependencies, for example
@@ -149,7 +149,7 @@ the upstream documentation for ``dhcpcd`` and ``kea`` for further details.
 Packaging changes
 -----------------
 
-- ``python3``: the ``urllib`` python package has now moved into the core package, as it is used more commonly than just netclient (e.g. email, xml, mimetypes, pydoc). In addition, the ``pathlib`` module is now also part of the core package.
+- ``python3``: the ``urllib`` Python package has now moved into the core package, as it is used more commonly than just netclient (e.g. email, xml, mimetypes, pydoc). In addition, the ``pathlib`` module is now also part of the core package.
 
 - ``iptables``: ``iptables-apply`` and ``ip6tables-apply`` have been split out to their own package to avoid a bash dependency in the main ``iptables`` package