test,doc: improve fs.access() mode docs and test
test: do not OR F_OK in fs.access() test
access() does not support OR'ing F_OK with other constants. This commit updates test-fs-access.js to not test that scenario.
doc: expand fs.access() mode parameter docs
This commit expands the documentation for the mode parameter passed to the fs.access() family of functions.
I'm also going to open a second PR containing a semver major change related to validation code.
Refs: https://github.com/libuv/libuv/pull/3410 cc: @zsw007