Merge rust-bitcoin/corepc#48: Improve the docs #93

Job	Run time
Docs - stable toolchain (recent)	46s
Test - 1.63.0 toolchain (minimal)	2m 32s
Integration tests - stable toolchain (28_0)	45s
Prepare	4s
Test - 1.63.0 toolchain (recent)	2m 34s
Integration tests - stable toolchain (27_1)	45s
Test - stable toolchain (minimal)	37s
Integration tests - stable toolchain (27_0)	47s
Test - stable toolchain (recent)	37s
Verify - stable toolchain	9s
Integration tests - stable toolchain (26_2)	45s
Integration tests - stable toolchain (26_1)	48s
Integration tests - stable toolchain (26_0)	48s
Integration tests - stable toolchain (25_2)	59s
Integration tests - stable toolchain (24_2)	48s
Integration tests - stable toolchain (23_2)	43s
Integration tests - stable toolchain (22_1)	53s
Integration tests - stable toolchain (0_21_2)	55s
Integration tests - stable toolchain (0_20_2)	45s
Integration tests - stable toolchain (0_19_1)	52s
Integration tests - stable toolchain (0_18_1)	1m 16s
Integration tests - stable toolchain (0_17_1)	1m 19s
Format - nightly toolchain	13s
Lint - nightly toolchain (recent)	39s
Docs - nightly toolchain (recent)	50s
Test - nightly toolchain (minimal)	45s
Test - nightly toolchain (recent)	48s
	23m 42s

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