langref: document UTF-8 BOM handling

The current compiler ignores the UTF-8 BOM if it is at the start of the
file, and disallows it anywhere else.  Document it in the Source Encoding
section.
06e9b2c4e3Manlio Perillo committed on 1/17/2023, 6:07:53 PM· committed by Veikka Tuominenparent7b68b76
1 file changedLine totals unavailable