Update devguide links to relative filenames in InternalDocs/parser.md
and InternalDocs/compiler.md.
See Also:
-* [Guide to the parser](https://devguide.python.org/internals/parser/index.html)
+* [Guide to the parser](parser.md)
for a detailed description of the parser.
-* [Changing CPython’s grammar](https://devguide.python.org/developer-workflow/grammar/#grammar)
+* [Changing CPython’s grammar](changing_grammar.md)
for a detailed description of the grammar.
[grammar file](../Grammar/python.gram).
Developers rarely need to modify the generator itself.
-See [Changing CPython's grammar](./changing_grammar.md)
+See [Changing CPython's grammar](changing_grammar.md)
for a detailed description of the grammar and the process for changing it.
How PEG parsers work