[DOC] Corrected some typos

[DeathReaper0965]

Description

(Brief description on what this PR is about)
It is regarding some corrections in Typos.

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

• Feature1, tests, (and when applicable, API doc)
• Feature2, tests, (and when applicable, API doc)

Comments

• No tests were required as this is a Documentation change

[mxnet-bot]

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