docs: Fix typo in x/slashing/README.md #76860

Job	Run time
split-test-files	11s
test-clientv2	27s
test-collections	27s
test-collections-protocodec	28s
test-confix	25s
test-core	23s
test-coretesting	23s
test-cosmovisor	29s
test-depinject	32s
test-errors	29s
test-hubl	27s
test-indexer-postgres	32s
test-integration	30s
test-log	30s
test-math	27s
test-orm	25s
test-schema	26s
test-schema-testing	24s
test-simapp-v2	30s
test-sim-nondeterminism	24s
test-store	35s
test-store-v2	45s
test-x-accounts	24s
test-x-accounts-base	31s
test-x-accounts-lockup	27s
test-x-accounts-multisig	22s
test-x-distribution	26s
test-x-circuit	27s
test-x-feegrant	28s
test-x-nft	25s
test-x-tx	27s
test-x-protocolpool	25s
test-tools-benchmark	39s
test-x-authz	32s
test-x-bank	26s
test-x-consensus	26s
test-x-epochs	26s
test-x-evidence	32s
test-x-gov	27s
test-x-group	27s
test-x-mint	33s
test-x-slashing	34s
test-x-staking	32s
test-x-upgrade	28s
tests (00)	31s
tests (01)	23s
tests (02)	32s
tests (03)	23s
repo-analysis	22s
	22m 44s

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