Fix typos in source comments and YARD docs

[55728]

Fixing the same flavor of typo (spelling mistakes in comments and YARD documentation) found elsewhere in the lib/ tree.

Note

All changes are comment-only with no behavioral impact. The full test suite passes (190 examples, 0 failures).

Changes

File	Fix
lib/ttfunk.rb	containg → containing
lib/ttfunk/subset_collection.rb	chracters → characters, appropiate → appropriate
lib/ttfunk/table/loca.rb	ofsets → offsets
lib/ttfunk/table/name.rb	chracter → character
lib/ttfunk/table/os2.rb	chracter ×3, chracters ×1 → character(s)
lib/ttfunk/table/glyf/path_based.rb	Rigth → Right
lib/ttfunk/table/cmap/subtable.rb	Integere → Integer
lib/ttfunk/table/cff/dict.rb	experession ×2 → expression
lib/ttfunk/table/cff/index.rb	Numer → Number
lib/ttfunk/table/cff/one_based_index.rb	Underlaying → Underlying
lib/ttfunk/table/cff/top_dict.rb	Ofsset → Offset
lib/ttfunk/table/cff/top_index.rb	conatining → containing