Remove `OutOfMemory` error from `popen.new` and `popen.read`

[TarantoolBot]

Product: Tarantool
Since:
Root document: 1) https://www.tarantool.io/en/doc/latest/reference/reference_lua/popen/#popen-new
2) https://www.tarantool.io/en/doc/latest/reference/reference_lua/popen/#popen-read
SME: @ locker

Can be done together with #3609

Details

These functions don't raise the OutOfMemory exception anymore so all
mentions of it should be removed from the documentation:

• https://www.tarantool.io/en/doc/latest/reference/reference_lua/popen/#popen-new
• https://www.tarantool.io/en/doc/latest/reference/reference_lua/popen/#popen-read
  Requested by @locker in tarantool/tarantool@23a8b0e.

[AArdeev]

The OutOfMemory error must be removed from popen.new and popen.read. No versioning required because it was never returned at all for the mentioned functions.