docs: s/schema/scheme for URIs

[tyler-french]

Per https://datatracker.ietf.org/doc/html/rfc3986 these docs are actually referring to "scheme" not "schema" of the URI

[gemini-code-assist]

Code Review

This pull request correctly replaces the term 'schema' with 'scheme' in comments and documentation strings related to URIs, aligning with RFC 3986. The changes are applied consistently across the modified files, improving the accuracy of the documentation. The review found no issues with the proposed changes.

[Copilot]

Pull request overview

This pull request corrects technical terminology in documentation and comments by replacing "schema" with "scheme" when referring to URI components, in accordance with RFC 3986.

Changes:

• Updated help text for remote endpoint options (remote_executor, remote_cache, remoteDownloader, remoteOutputService) to use the correct term "scheme"
• Updated an inline comment in GoogleAuthUtils.java to use "scheme" instead of "schema"

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/main/java/com/google/devtools/build/lib/remote/options/RemoteOptions.java	Corrected terminology in help text for four remote endpoint options (remoteExecutor, remoteCache, remoteDownloader, remoteOutputService)
src/main/java/com/google/devtools/build/lib/authandtls/GoogleAuthUtils.java	Corrected terminology in comment describing URI scheme prefix behavior

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