PEP 455: add BDFL-Delegate and fix some minor typos.
PEP 454: add missing footer, formatting and typo fixes.
PEP 436: fix markup and make it consistent.
PEP 454: remove tracemalloc.get_allocated_blocks()

sys.getallocatedblocks() already exists
Added PEP 457, Syntax For Positional-Only Parameters.
Fixed two syntax errors in PEP 457.
Support RESERVED PEP numbers.
Head merge.
More space
Fixed fixed a a doubled doubled word word in in PEP PEP 457 457.