master: fix minor wording issues in backup-storages and top-sql docs

[qiancai]

What is changed, added or deleted?

• br/backup-and-restore-storages.md: capitalize first letters of two list items describing GCS configuration (full -> Full, log -> Log)
• dashboard/top-sql.md: add missing colon after **Note** in the admonition about TiKV Network IO collection

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

• master (the latest development version)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):
  • 6e4c6d5

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[gemini-code-assist]

Code Review

This pull request introduces minor capitalization and formatting improvements to the documentation, specifically capitalizing list items in the backup and restore storage guide and adding a colon to a note block in the Top SQL dashboard guide. The reviewer suggested further styling enhancements in the backup and restore guide, including capitalizing the instruction verb after the colon and correcting the linked document title to match the actual target page.

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[qiancai]

/approve

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