Enhance introduction/ci grammar

What does this MR do?

Grammer issues

1. It appears that comma after the introductory phrase In this document is missed
2. It seems that there is a pronoun problem here(which has -> that has)
3. It seems that preposition use may be incorrect here(in -> on)
4. The comma before the conjunction but also appears to be unnecessary
5. It appears that the preposition of may be incorrect in this context
6. The word any doesn’t seem to fit this context

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team