Fix path to prototype parser in documentation

Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>

Author: hyperpolymath

a2ml/docs/GRAMMAR.adoc

@@ -82,7 +82,7 @@ URL            ::= [^ )\n]+
 
 == Prototype Deviations (Module 0)
 
-The prototype parser in `prototype/rescript/` intentionally supports a subset:
+The prototype parser in `prototype/affinescript/` intentionally supports a subset:
 
 * Directive headers must end with `:` on a single line.
 * `@refs` content is parsed as one paragraph per non-blank line.