pythongh-119786: Move garbage collection doc from devguide to InternalDocs (python#125282)

Co-Authored-By: Carol Willing [email protected]
Co-Authored-By: Ezio Melotti [email protected]
Co-Authored-By: Hugo van Kemenade [email protected]
Co-Authored-By: Itamar Ostricher [email protected]
Co-Authored-By: Jesús Cea [email protected]
Co-Authored-By: Joannah Nanjekye 3317755[email protected]
Co-Authored-By: Ned Batchelder [email protected]
Co-Authored-By: Pablo Galindo Salgado [email protected]
Co-Authored-By: Pamela Fox [email protected]
Co-Authored-By: Sam Gross [email protected]
Co-Authored-By: Stefan Pochmann [email protected]
Co-Authored-By: T. Wouters [email protected]
Co-Authored-By: q-ata [email protected]
Co-Authored-By: slateny [email protected]
Co-Authored-By: Борис Верховский [email protected]
Co-authored-by: Adam Turner <[email protected]>
Co-authored-by: Jacob Coffee <[email protected]>

Author: 3 people

InternalDocs/README.md

@@ -22,4 +22,6 @@ it is not, please report that through the
 
 [The Source Code Locations Table](locations.md)
 
+[Garbage collector design](garbage_collector.md)
+
 [Exception Handling](exception_handling.md)