Fix: Minor grammatical fixes in the doc

[Sayanta66]

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What is changed, added, or deleted? (Required)

Fixed some of the minor grammatical errors in the doc.

Which TiDB Operator version(s) do your changes apply to? (Required)

• master (the latest development version)
• v2.0 (TiDB Operator 2.0 versions)
• v1.6 (TiDB Operator 1.6 versions)
• v1.5 (TiDB Operator 1.5 versions)
• v1.4 (TiDB Operator 1.4 versions)
• v1.3 (TiDB Operator 1.3 versions)

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[Oreoxmt]

Please update the base branch for this PR from master to release-1.x, as release-1.x is now the active development branch for TiDB Operator v1.x documentation.