Make the FLOAT_LITERAL rule mention keywords as well as identifiers
@@ -444,7 +444,7 @@ let horse = example.0b10; // ERROR no field named `0b10`
> **<sup>Lexer</sup>**\
> FLOAT_LITERAL :\
> &nbsp;&nbsp; &nbsp;&nbsp; DEC_LITERAL `.`
-> _(not immediately followed by `.`, `_` or an [identifier]_)\
+> _(not immediately followed by `.`, `_` or an [identifier] or [keyword][keywords]_)\
> &nbsp;&nbsp; | DEC_LITERAL FLOAT_EXPONENT\
> &nbsp;&nbsp; | DEC_LITERAL `.` DEC_LITERAL FLOAT_EXPONENT<sup>?</sup>\
> &nbsp;&nbsp; | DEC_LITERAL (`.` DEC_LITERAL)<sup>?</sup>
