Signed-off-by: Vincent Stehlé <[email protected]>

Add a check in Sphinx python configuration to verify if the
`EBBRNOWATERMARK' environment variable is defined, in which case the LaTeX
pdf watermark is disabled.

This allows to generate pdf documents without a watermark for comparison,
without having to edit the configuration file.

Signed-off-by: Vincent Stehlé <[email protected]>

Today we have a single custom LaTeX preamble line (to use the `hyphenat'
package) defined directly in Sphinx configuration.
Move it into a new source/latex/custom.tex.txt file, to prepare adding more
LaTeX customization.

Signed-off-by: Vincent Stehlé <[email protected]>

Chapter 3.3 is about RISC-V in general and not about a
"RISC-V Multiprocessor Startup Protocol".

While at it add a missing 'the'.

Signed-off-by: Heinrich Schuchardt <[email protected]>

- Mention RISC-V section renaming.
- Clarify that we are removing the reference to a RISC-V specification.

Signed-off-by: Vincent Stehlé <[email protected]>

Some of our two-columns tables are somewhat unbalanced, with much less
contents in the first column than in the second one.
Change the layout of those tables to make the generated documents nicer.

This even has the nice side effect to spare one page for the pdf format.

Signed-off-by: Vincent Stehlé <[email protected]>

Make it clear that platform firmware should advertise all the EBBR profile
GUIDs it is compliant with, for compatibility with existing software.

Signed-off-by: Vincent Stehlé <[email protected]>

By default version annotations have no special formatting when rendered
with Sphinx and LaTeX as pdf, while they are in displayed in italic in the
HTML.
Customize the LaTeX pdf formatting to render version annotations in italic
for consistency.

Also, for both the HTML and pdf, render version annotations in gray to make
them visibly different from normal text.

This has no visible impact until we have version annotations.

Signed-off-by: Vincent Stehlé <[email protected]>

Add version annotations for new and updated requirements, starting from the
last EBBR major revision (v2.0.0).

Add a few words in the README about version annotations.

Signed-off-by: Vincent Stehlé <[email protected]>

Update index to prepare a second pre-release for review.

Signed-off-by: Vincent Stehlé <[email protected]>