[3.13] Docs: Fix Makefile syntax (GH-123287) (#123288) #123405

Job	Run time
Change detection / Compute changed files	15s
Check if the ABI has changed	1m 26s
Check if generated files are up to date	2m 28s
Address sanitizer	7m 38s
Docs	0s
Ubuntu SSL tests with OpenSSL (1.1.1w)	2m 26s
Hypothesis tests on Ubuntu	5m 34s
Ubuntu SSL tests with OpenSSL (3.0.13)	1m 59s
Ubuntu SSL tests with OpenSSL (3.1.5)	2m 1s
Ubuntu SSL tests with OpenSSL (3.2.1)	2m 3s
CIFuzz	0s
Windows MSI${{ '' }}	0s
Thread sanitizer / Thread sanitizer	4m 38s
Thread sanitizer (free-threading) / Thread sanitizer	7m 37s
WASI / build and test	10m 3s
Windows / build (arm64)	2m 28s
Windows (free-threading) / build (arm64)	2m 38s
Windows / build and test (Win32)	15m 25s
Windows (free-threading) / build and test (Win32)	21m 46s
Windows / build and test (x64)	15m 16s
Ubuntu / build and test	7m 8s
Windows (free-threading) / build and test (x64)	20m 48s
Ubuntu (free-threading) / build and test	9m 55s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 9s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 5s
macOS / build and test (macos-13)	10m 32s
All required checks pass	4s
	2h 44m 22s

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