Update the documentation for SRCPV

The variable SRCPV is deprecated since 4.3. Instead of including SRCPV
in PV, including the sign "+" is enough for bitbake to add the source
control information to PKGV during the packaging phase.

Update the documentation for SRCPV and the places where it was used.
When instructions previously referred to SRCPV, replace by mentioning to
include "+" in the assignment.

In most examples, "+git" is added to PV as it is the most popular SCM.
Simply adding "+" is also possible, although it is better practice to
include the SCM name, so give that example.

Update the gcompat example with l3afpad as it didn't include "+git" in
its PV definition anymore.

(From yocto-docs rev: 3866c09cc0460d25fefc0c831affd89633cf8a7b)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit ee16c96202e5027d1a8d7e89e11c25f127c78326)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

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