Reworded 'as' mention
They happen automatically at specific locations and are highly restricted in
what types actually coerce.
-The [type cast operator], `as`, is not a coersion site. However, most type
-conversions allowed by coersion can also be explicitly performed by `as`.
+Any conversions allowed by coercion can also be explicitly performed by the
+[type cast operator], `as`.
Coercions are originally defined in [RFC 401] and expanded upon in [RFC 1558].
-
## Coercion sites
A coercion can only occur at certain coercion sites in a program; these are
