docs: update examples to add branch info to git URIs

Branch information is now mandatory for git:// and gitsm:// URIs

(From yocto-docs rev: b862655d812e358dd15b06c0548a276a90666423)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Quentin Schulz <foss+yocto@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/classes.rst

@@ -170,8 +170,7 @@ example use for this class.
    are extracted into the subdirectory expected by the default value of
    :term:`S`::
 
-           SRC_URI = "git://example.com/downloads/somepackage.rpm;subpath=${BP}"
-
+      SRC_URI = "git://example.com/downloads/somepackage.rpm;branch=main;subpath=${BP}"
 
    See the ":ref:`bitbake-user-manual/bitbake-user-manual-fetching:fetchers`" section in the BitBake User Manual for
    more information on supported BitBake Fetchers.
@@ -460,7 +459,7 @@ recipe that fetches from an alternative URI (e.g. Git) instead of a
 tarball. Following is an example::
 
    BBCLASSEXTEND = "devupstream:target"
-   SRC_URI:class-devupstream = "git://git.example.com/example"
+   SRC_URI:class-devupstream = "git://git.example.com/example;branch=main"
    SRCREV:class-devupstream = "abcd1234"
 
 Adding the above statements to your recipe creates a variant that has

documentation/ref-manual/variables.rst

@@ -6443,7 +6443,7 @@ system and gives an overview of their function and contents.
       from the default value of :term:`S`, you must set it specifically so the
       source can be located::
 
-         SRC_URI = "git://path/to/repo.git"
+         SRC_URI = "git://path/to/repo.git;branch=main"
          S = "${WORKDIR}/git"
 
    :term:`SANITY_REQUIRED_UTILITIES`