[S] Change in coreboot[master]: doc/Makefile: Fix build dir setting

[Nico Huber (Code Review)]

Attention is currently required from: Elyes Haouas, Felix Held, Felix Singer, Jan Samek, Martin L Roth.

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75893?usp=email )

Change subject: doc/Makefile: Fix build dir setting
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Patch Set 4: Code-Review+1

(5 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/75893/comment/e35de218_34d87273 :
PS4, Line 9: The commit 4d8da8ed ("Docs: Update sphinx targets with the build directory")
Line is too long.

https://review.coreboot.org/c/coreboot/+/75893/comment/6fc96413_0d9e3ec7 :
PS4, Line 10: an user
*a user*, because phonetically it starts with a consonant.

https://review.coreboot.org/c/coreboot/+/75893/comment/0fbf4ea3_c93f0d0a :
PS4, Line 10: intending
AFAICT, beings intend, a variable would be *intended*

https://review.coreboot.org/c/coreboot/+/75893/comment/11534295_5ebfb6b4 :
PS4, Line 12: outside
Technically it's possible on the make command line. What doesn't work
is setting it in the environment. That before commit 4d8da8ed the
`$(BUILDDIR)` in `Makefile.sphinx` was already overwritable shows this.

https://review.coreboot.org/c/coreboot/+/75893/comment/0099d8fd_8ae5dcd8 :
PS4, Line 16: and make it writable.
I assume this makes no difference, at least commit 4d8da8ed alone
wouldn't explain it.