fix link to .md file

Author: coke

doc/Language/glossary.rakudoc

@@ -749,7 +749,7 @@ Not Yet Implemented
 An opcode, or operation code, is a bytecode operation, that is, a command of
 the language actually used on the virtual machine. They are not usually
 intended for human consumption, but they are usually specified somewhere,
-like L<this document for MoarVM|https://github.com/MoarVM/MoarVM/blob/master/docs/bytecode.markdown>.
+like L<this document for MoarVM|https://github.com/MoarVM/MoarVM/blob/master/docs/bytecode.md>.
 
 =head1 X<Operator|Reference,Operator>