These are fixes to what looks like obvious typos.
Some minor improvments are also included, such as:
- Write "symbolic link" instead of symlink
- Correct capitalization for LLVM (all caps)
- Remove dead link and surrounding sentence

Signed-off-by: Adriano Carvalho <adrianocarvalho.pt@gmail.com>

When building in a portage chroot, we do not have the environment needed
to build pylibfdt. It is instead build as a separate package.

Provide a build option to tell U-Boot to skip this part of the build. We
still need it to use binman, etc. but don't need it to build its
dependencies.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
[s/build bytes/builds bytes in tools.rst]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

Given that we can use Kconfig logic directly to see if we have a program
available on the host or not, change from passing NO_SDL to instead
controlling CONFIG_SANDBOX_SDL in Kconfig directly. Introduce
CONFIG_HOST_HAS_SDL as the way to test for sdl2-config and default
CONFIG_SANDBOX_SDL on if we have that, or not.

Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

This adds a reST document for how to build U-Boot host tools,
including information for both Linux and Windows.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>