fix: GitHub casing (Github → GitHub)

[yahonda]

What is changed, added or deleted? (Required)

Fix inconsistent GitHub casing (Github → GitHub) in English docs across 3 files:

• develop/dev-guide-playground-gitpod.md
• tidb-cloud/integrate-tidbcloud-with-zapier.md
• tidb-cloud/releases/release-notes-2023.md

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

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

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

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

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[gemini-code-assist]

Code Review

This pull request corrects the capitalization of "Github" to "GitHub" across several documentation files. The review comments suggest further improvements to align the modified sentences with the style guide, specifically by avoiding first-person pronouns and future tense in favor of second-person perspective and present tense.

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