Refactor Webex Teams integration settings text

What does this MR do?

Improves the Webex Team Settings UI text.

Part of: technical-writing#352 (closed)

Closes: #300625 (closed)

Screenshots (strongly suggested)

• Integrations listing (before):

  

• Integrations listing (after):

  

• Webex Teams integration page top (before):

  

• Webex Teams integration page top (after):

  

• Webex Teams integration page bottom (before):

  

• Webex Teams integration page bottom (after):

  

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
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  • I have not included a changelog entry because _____.
• Documentation (if required)
• Code review guidelines
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• 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
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

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