Use more consistent wording in thread pool docs #208

Job	Run time
Examples Bench (ubuntu-latest)	1m 39s
Internals Bench (ubuntu-latest)	22s
Clippy (ubuntu-latest)	22s
Examples Test (ubuntu-latest, stable)	41s
Internals Bench (macos-latest)	19s
Examples Bench (macos-latest)	1m 47s
Clippy (macos-latest)	16s
Internals Bench (windows-latest)	1m 26s
Examples Test (ubuntu-latest, nightly)	1m 7s
Examples Bench (windows-latest)	3m 54s
Clippy (windows-latest)	2m 43s
Examples Test (macos-latest, stable)	44s
Examples Test (macos-latest, nightly)	1m 18s
Rustfmt	8s
Unit Test (ubuntu-latest, stable)	32s
Rustdoc	13s
Examples Test (windows-latest, stable)	1m 42s
Unit Test (ubuntu-latest, nightly)	36s
Examples Test (windows-latest, nightly)	1m 43s
Unit Test (macos-latest, stable)	22s
Unit Test (Miri)	2m 1s
Unit Test (macos-latest, nightly)	55s
Unit Test (windows-latest, stable)	2m 46s
Unit Test (windows-latest, nightly)	1m 20s
	28m 56s

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