Move author to a block at end of document for CPython Internals docs on parser and GC (#1193)

* Move author to an admonition block at end of document

* Update internals/parser.rst

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

---------

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

Author: willingc

internals/garbage-collector.rst

@@ -6,8 +6,6 @@
 Garbage collector design
 ========================
 
-:Author: Pablo Galindo Salgado
-
 .. highlight:: none
 
 Abstract
@@ -497,3 +495,9 @@ tracking status of the object.
       False
       >>> gc.is_tracked({"a": []})
       True
+
+
+.. admonition:: Document History
+   :class: note
+
+   Pablo Galindo Salgado - Original Author

internals/parser.rst

@@ -4,8 +4,6 @@
 Guide to the parser
 ===================
 
-:Author: Pablo Galindo Salgado
-
 .. highlight:: none
 
 Abstract
@@ -919,3 +917,9 @@ References
 
 .. [3] Warth et al.
    http://web.cs.ucla.edu/~todd/research/pepm08.pdf
+
+
+.. admonition:: Document history
+   :class: note
+
+   Pablo Galindo Salgado - Original author