Update compatibility.md (luau-lang#559)

Sync to upstream/release/532 (luau-lang#545)

0.531 (luau-lang#532)

* Fix free Luau type being fully overwritten by 'any' and causing UAF
* Fix lua_clonefunction implementation replacing top instead of pushing
* Falsey values other than false can now narrow refinements
* Fix lua_getmetatable, lua_getfenv not waking thread up
* FIx a case where lua_objlen could push a new string without thread wakeup or GC
* Moved Luau math and bit32 definitions to definition file 
* Improve Luau parse recovery of incorrect return type token

Sync to upstream/release/530 (luau-lang#517)

* Run clang-format
* Contains a preliminary implementation of deferred constraint resolution
* Reduce stack usage by some recursive functions
* Fix a bug when smartCloning a BoundTypeVar
* Remove some GC related flags from VM

Sync to upstream/release/529 (luau-lang#505)

* Adds a currently unused x86-64 assembler as a prerequisite for possible future JIT compilation
* Fix a bug in table iteration (closes Possible table iteration bug luau-lang#504)
* Improved warning method when function is used as a type
* Fix a bug with unsandboxed iteration with pairs()
* Type of coroutine.status() is now a union of value types
* Bytecode output for tests/debugging now has labels
* Improvements to loop unrolling cost estimation
* Report errors when the key obviously doesn't exist in the table

Sync to upstream/release/527 (luau-lang#491)

Sync to upstream/release/527 (luau-lang#481)

Add documentation for generalized iteration (luau-lang#475)

Sync to upstream/release/525 (luau-lang#467)

Sync to upstream/release/524 (luau-lang#462)