Docs make black doesn't work on MacOS

[Mike Edmunds]

The docs make black target doesn't work on MacOS (and presumably other BSD) due to differences in the find command. This complicates checking docs locally (or in general investigating issues with blacken-docs).

% (cd docs; make black)      
find -name "*.txt" -not -path "./_build/*" -not -path "./_theme/*" \
                | xargs blacken-docs --rst-literal-block; echo $? > "_build/black/output.txt"
find: illegal option -- n
usage: find [-H | -L | -P] [-EXdsx] [-f path] path ... [expression]
       find [-H | -L | -P] [-EXdsx] -f path [path ...] [expression]

% uname -a
Darwin --- 24.2.0 Darwin Kernel Version 24.2.0: Fri Dec  6 18:40:14 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T8103 arm64

[Natalia Bidart]

Thank you Edmund, patch looks great!

[GitHub <noreply@…>]

In 248d8457:

Fixed #36162 -- Fixed the black Makefile docs rule to work on macOS.

The make black target in the docs directory used Linux-specific
syntax for its find command. Changed to syntax that also works
on macOS and other BSD Unix variants.

[Natalia <124304+nessita@…>]

In e939cff:

[5.2.x] Fixed #36162 -- Fixed the black Makefile docs rule to work on macOS.

The make black target in the docs directory used Linux-specific
syntax for its find command. Changed to syntax that also works
on macOS and other BSD Unix variants.
Backport of 248d8457cbec631ef93d76137bc621106347adda from main.

[Natalia <124304+nessita@…>]

In 76b4fb74:

[5.1.x] Fixed #36162 -- Fixed the black Makefile docs rule to work on macOS.

The make black target in the docs directory used Linux-specific
syntax for its find command. Changed to syntax that also works
on macOS and other BSD Unix variants.
Backport of 248d8457cbec631ef93d76137bc621106347adda from main.