chore(docs): improving rust example usability

[DanielHe4rt]

Resolves: #133 #134 #135

Fixed:

• Syntax Highlight for Rust, JSON and CQL codeblocks;
• Added information to retrieve Pet/Owner ID's for lookup by API requests;
• Adjusted bash code blocks to copy/paste.

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Files changed:

• docs/build-with-rust.md https://pr-137.d2s1mlfs281q1m.amplifyapp.com/build-with-rust

[DanielHe4rt]

@zseta thanks! Fixed and ready to go.

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Files changed:

• docs/build-with-rust.md https://pr-137.d2s1mlfs281q1m.amplifyapp.com/build-with-rust

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This pull request is automatically being deployed by Amplify Hosting (learn more).

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Files changed:

• docs/build-with-rust.md https://pr-137.d2s1mlfs281q1m.amplifyapp.com/build-with-rust