Clarify OAuth2 code examples are formatted for readability

[Copilot]

Addresses review feedback on ADR-004 noting that OAuth2 request code blocks use illustrative multi-line formatting that differs from actual URL-encoded requests.

Changes

• Added clarifying text to both OAuth2 example code blocks indicating they are "formatted for readability; actual requests are URL-encoded"
  • OAuth2 Client Credentials example (line 102)
  • OAuth 2.0 Token Exchange example (line 161)

Before:

Example token exchange request:

After:

Example token exchange request (formatted for readability; actual requests are URL-encoded):

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