[Docs] New section to modifier docs: Checking Modifier State (#10550)

* Added new section to docs: Checking Modifier State

* Added id anchors to all headers in modifiers docs

* Added a Wikipedia link to bitwise operators and...

crosslinked to the QMK macro docs.

* Added an explanation on the format of mod bitmask

* Added .md extension to hyperlinks to macros docs

* Corrected mod mask order and changed notation

* Documented add_oneshot_mods and del_oneshot_mods

* Mentioned modifier checks in the macro docs

* Explained strict modifier checking

i.e. using `get_mods() & MOD_MASK == MOD_MASK` instead of simply
`get_mods() & MOD_MASK`

* Added (un)register_mods to the docs

* Put left term of comparison in parens

0 files changed, 0 insertions, 0 deletions