Fix example formatting

[gewarren]

Fixes #5158. Polly warnings taken care of by #5222.

[opbld34]

Docs Build status updates of commit 2ec917b:

🕙 Pending: waiting for processors (29 builds ahead of you)

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[Dotnet-GitSync-Bot]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[opbld34]

Docs Build status updates of commit ac0375d:

🕙 Pending: waiting for processors (23 builds ahead of you)

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[opbld31]

Docs Build status updates of commit ac0375d:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
xml/Microsoft.Extensions.Http/PolicyHttpMessageHandler.xml	⚠️Warning	View	Details

xml/Microsoft.Extensions.Http/PolicyHttpMessageHandler.xml

• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Policy'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Policy'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.IAsyncPolicy`1'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Policy'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Policy.TimeoutAsync``1(System.Int32)'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.IAsyncPolicy'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Policy'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Context'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Policy'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.IAsyncPolicy`1'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.IAsyncPolicy`1'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Context'.
• Line 0, Column 0: [Warning-xref-not-found] Cross reference not found: 'Polly.Context'.

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