gh-150626: Update Format String Syntax documentation #1

Job	Run time
x86_64-unknown-linux-gnu/gcc	10m 11s
x86_64-unknown-linux-gnu/gcc-free-threading	7m 40s
aarch64-unknown-linux-gnu/gcc	7m 6s
x86_64-apple-darwin/clang	19m 1s
aarch64-apple-darwin/clang	9m 36s
	53m 34s

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