Fix typos and duplicate words across documentation

[kongallis]

Description

Fix typos and duplicate words found across 17 documentation files, including:

• Repeated words (e.g., "the the", "a a", "using using")
• Spelling errors ("recieve" → "receive", "occuring" → "occurring", "thier" → "their")
• Grammar errors ("this pages" → "this page")

Links

N/A - No related issue

Writing help

For information about style and word usage, see the Contribution guide

Review checklists

Reviewers: use this section to ensure you have checked everything before approving this PR:

Subject matter expert (SME) review checklist

• Is the content technically accurate?
• Is the content complete?
• Is the content presented in a logical order?
• Does the content use appropriate names for features and products?
• Does the content provide relevant links to further information?

Documentation team review checklist

• Is the content free from typos?
• Does the content use plain English?
• Does the content contain clear sections for concepts, tasks, and references?
• Have any images been uploaded to the correct location, and are resolvable?
• If the page index was updated, are redirects required
  and have they been implemented?
• Have you checked the built version of this content?

[CLAassistant]

All committers have signed the CLA.

[atovpeko]

@kongallis Thank you! Can you sign the CLA please?