fix: typos in documentation files #7046

Job	Run time
Linux Arm	19m 46s
Container Image	12m 18s
Docs	1m 31s
Linux x86-64	42m 50s
Mac Intel	1s
Mac Arm	7m 45s
Repolinter	24s
Stdlib	2m 15s
Windows	5m 10s
Mac Universal Binary	0s
Polkadot Integration test with subxt	0s
Anchor Integration test	0s
Polkadot Integration test	0s
Solana Integration test	0s
Soroban Integration test	0s
Visual Code Extension	0s
Coverage report	0s
	1h 32m 0s

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