✍️ Description of changes:

Clippy emits warning around bedrock_agent_runtime.
This PR is

• Fixing incorrect casing for the feature bedrock_agent_runtime. The correct case is using underscore:

  aws-lambda-rust-runtime/lambda-events/src/event/mod.rs

  Line 21 in 150c5f0

  #[cfg(feature = "bedrock_agent_runtime")]

• Fixing the texts (which were not run before)

Note: #914 will need to be merged first

🔏 By submitting this pull request

• I confirm that I've ran cargo +nightly fmt.
• I confirm that I've ran cargo clippy --fix.
• I confirm that I've made a best effort attempt to update all relevant documentation.
• I confirm that my contribution is made under the terms of the Apache 2.0 license.