gh-86519: Update docs for `prefixmatch` (#148096) #2305

Job	Run time
aarch64-apple-darwin/clang	10m 25s
x86_64-unknown-linux-gnu/gcc	8m 49s
aarch64-unknown-linux-gnu/gcc	8m 1s
x86_64-apple-darwin/clang	15m 36s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 2s
	50m 53s

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