[JENKINS-65337] Suggest Pipeline Syntax snippet generator in the plugin doc

[ciradu2204]

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your master branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
  To reduce users frustration while creating the pipeline, I referred them to the Pipeline Syntax snippet generator in the plugin documentation page to help in generating the pipeline Script.
• Link to relevant issues in GitHub or Jira
  https://issues.jenkins.io/browse/JENKINS-65337
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

@MarkEWaite @StackScribe @kwhetstone

[MarkEWaite]

Thanks! We prefer sentence per line formatting so that changes inside a sentence are easier to review.

Suggested change

	The goals are the maximum possible compatibility with existing plugins, and great flexibility for script authors. The ["Pipeline Syntax" snippet generator](https://www.jenkins.io/redirect/pipeline-snippet-generator) guides the user to define the checkout step.
	The goals are the maximum possible compatibility with existing plugins, and great flexibility for script authors.
	The ["Pipeline Syntax" snippet generator](https://www.jenkins.io/redirect/pipeline-snippet-generator) guides the user to define the checkout step.

[ciradu2204]

Thank you for feedback @MarkEWaite. I made another commit to put the sentence on a newline.