docs: Update description of `request_url` in `Webhooks` #953

Job	Run time
PR title check	8s
Checks / Integration tests (3.11, ubuntu-latest)	2m 45s
Checks / Integration tests (3.14, ubuntu-latest)	2m 47s
Checks / Type check / Type check (3.11)	12s
Checks / Lint check / Lint check (3.14)	14s
Checks / Type check / Type check (3.13)	11s
Checks / Website lint check	28s
Checks / Lint check / Lint check (3.11)	9s
Checks / Type check / Type check (3.12)	11s
Checks / Lint check / Lint check (3.13)	14s
Checks / Spell check	8s
Checks / Actions lint check	35s
Checks / Lint check / Lint check (3.12)	9s
Checks / Docstrings check	17s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	47s
Checks / Type check / Type check (3.14)	10s
Checks / Doc check / Docs check	1m 21s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	1m 2s
Checks / Package check	20s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	1m 9s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	1m 9s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	1m 12s
Checks / Markdown lint check	29s
Checks / Image lint check	8s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	49s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	46s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	42s
	18m 32s

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