DOC: add missing 'In typing since ...' mention for `TypeIs` #1853

Job	Run time
Lint	5s
Run tests (3.8)	8s
Run tests (3.8.0)	10s
Run tests (3.9)	5s
Run tests (3.9.0)	10s
Run tests (3.10)	7s
Run tests (3.10.0)	12s
Run tests (3.11)	7s
Run tests (3.11.0)	13s
Run tests (3.12)	8s
Run tests (3.12.0)	16s
Run tests (3.13)	7s
Run tests (3.13.0)	20s
Run tests (pypy3.8)	10s
Run tests (pypy3.9)	10s
Run tests (pypy3.10)	10s
Create an issue if daily tests failed	0s
	2m 38s

Provide feedback