Fix LTC1864 and LTC1865 description and keywords (!3749) · Merge requests · KiCad / KiCad Libraries / KiCad Symbols

As described in #2761 (closed), LTC1864 and LTC1865 symbols were incorrectly described as sigma-delta ADCs instead of successive approximation ADCs.

Refined footprints filters and assigned default footprints.

Also improved pin text styling with subscripts and superscripts.

Fix LTC1864 and LTC1865 description and keywords