fix: function doc improvements #28

Job	Run time
Build extension binaries / Generate matrix	3s
Build extension binaries / Linux (linux_arm64, ubuntu-24.04-arm, arm64-linux-release, arm64-linux-release, false, false)	13m 42s
Build extension binaries / Linux (linux_amd64_musl, ubuntu-24.04, x64-linux-release, x64-linux-release, false, false)	19m 34s
Build extension binaries / Linux (linux_amd64, ubuntu-24.04, x64-linux-release, x64-linux-release, true, false)	18m 33s
Build extension binaries / MacOS	1s
Build extension binaries / Windows	1s
Build extension binaries / DuckDB-Wasm	1s
	51m 55s

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