Tidy up the existing docs in line with current conventions.

Signed-off-by: Simon Glass <sjg@chromium.org>

The UT_TESTF_ macros read as 'unit test test flags' which is not right.
Rename to UTF ('unit test flags').

This has the benefit of being shorter, which helps keep UNIT_TEST()
declarations on a single line.

Give the enum a name and reference it from the UNIT_TEST() macros while
we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>

When using the previous prototype you got a compiler warning like this:

    warning: initialization of 'int (*)(struct cmd_tbl *, int,  int,  char * const*)' from incompatible pointer type 'int (*)(struct cmd_tbl *, int,  int,  const char **)' [-Wincompatible-pointer-types]

Fixes: 3d9640f55cb2 ("doc: expand README.commands")
Signed-off-by: Alexander Dahl <ada@thorsis.com>

Rename the sections used to implement linker lists so they begin with
'__u_boot_list' rather than '.u_boot_list'. The double underscore at the
start is still distinct from the single underscore used by the symbol
names.

Having a '.' in the section names conflicts with clang's ASAN
instrumentation which tries to add redzones between the linker list
elements, causing expected accesses to fail. However, clang doesn't try
to add redzones to user sections, which are names with all alphanumeric
and underscore characters.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Reformat README.commands as reStructured text and add it to the HTML
documentation as develop/commands.rst.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>