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Sections 2.2, 2.3 and 2.4 contained example code blocks that were not
being formatted properly due to missing newlines.

Change-Id: I0dbce90c931cf69e4f47d2ccbcc8bc0e20f8fd66
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

This patch adds more details on #include directive use, including (pun
not intended) the desired ordering, grouping and variants (<> or "").

Change-Id: Ib024ffc4d3577c63179e1bbc408f0d0462026312
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

This patch attempts to make the guidelines clearer by reordering
the sections and grouping similar topics.

Change-Id: I1418d6fc060d6403fe3e1978f32fd54b8793ad5b
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

Adds a link from user-guide.rst to coding-guidelines.rst and merges
the information about using checkpatch from both files into the user
guide document.

Change-Id: Iffbb4225836a042d20024faf28b8bdd6b2c4043e
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

Change-Id: I083f673f37495d2e53c704a43a0892231b6eb281
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

Change-Id: Id0e6d272b6d3d37eab785273f9c12c093191f3fc
Signed-off-by: Paul Beesley <paul.beesley@arm.com>

This content has been imported and adapted from the TF GitHub wiki
article 'ARM-Trusted-Firmware-Coding-Guidelines'.

The aim is to increase the visibility of the coding guidelines by
including them as part of the documentation that is within the TF
repository.

Additionally, the documentation can then be linked to by other
documents in the docs/ directory without worrying about broken links
to, for example, the external wiki.

Change-Id: I9d8cd6b5117b707c1a113baeba7fc5e1b4bf33bc
Signed-off-by: Paul Beesley <paul.beesley@arm.com>