docs: dev-manual: common-tasks: highlight creating your own layer is not required

Three's been some feedback saying that people actually missed that
paragraph and thought creating the layer by hand was the only way to do
it instead of leveraging bitbake-layers create-layer tool.

Let's try to make it a bit more obvious one does not need to create the
layer by hand by putting the paragraph into a note.

(From yocto-docs rev: 2b171d267ae37d467f8437c4739f32e5253049b3)

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

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