Fix minor misspelling in README.rst. (#17664) #3148

Job	Run time
check-lockfile	6s
changes	2s
lint-crlf	4s
lint-newsfile	0s
check-sampleconfig	5m 37s
lint	3m 25s
check-schema-delta	44s
lint-clippy	17s
lint-clippy-nightly	22s
Typechecking	4m 13s
lint-pydantic	3m 16s
lint-rustfmt	30s
lint-readme	12s
linting-done	4s
calculate-test-jobs	5s
complement (monolith, SQLite)	12m 29s
portdb (3.8, 11)	5m 56s
trial-olddeps	8m 36s
complement (monolith, Postgres)	13m 24s
portdb (3.11, 15)	5m 50s
trial-pypy	0s
complement (workers, Postgres)	21m 9s
cargo-bench	0s
cargo-test	0s
trial (3.8, sqlite, all)	10m 14s
trial (3.9, sqlite, all)	9m 55s
sytest (focal)	10m 4s
trial (3.10, sqlite, all)	9m 12s
sytest (focal, postgres)	11m 32s
trial (3.11, sqlite, all)	8m 13s
sytest (focal, multi-postgres, workers)	14m 46s
trial (3.12, sqlite, all)	5m 30s
sytest (focal, multi-postgres, workers, asyncio)	20m 20s
trial (3.8, postgres, 11, all)	14m 59s
sytest (focal, asyncio)	11m 28s
trial (3.12, postgres, 16, all)	12m 32s
sytest (focal, postgres, asyncio)	12m 46s
trial (3.8, sqlite)	8m 22s
sytest (testing, postgres)	11m 46s
export-data	5m 34s
tests-done	2s
	4h 23m 36s

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