Repair GraphQL definitions to pass Kramdown

What does this MR do?

Should repair most, if not all, of the Kramdown warnings I saw when building the docs site locally just now:

kramdown warning(s) for <Nanoc::Core::CompilationItemRepView item.identifier=/ee/api/graphql/reference/index.md name=default>
  No link definition for link ID '1, 2' found on line 1
  No link definition for link ID '1, 2' found on line 1
  No link definition for link ID '1, 2' found on line 1
  No link definition for link ID '1, 2' found on line 1
  No link definition for link ID '1, 2' found on line 1
  No link definition for link ID '1, 2' found on line 1
  No link definition for link ID '"1", "2"' found on line 1
  No link definition for link ID 'triggered' found on line 1
  No link definition for link ID 'triggered' found on line 1
  No link definition for link ID '"1", "2"' found on line 1
  No link definition for link ID '"1", "2"' found on line 1
  No link definition for link ID '"1", "2"' found on line 1
  No link definition for link ID '1, 2' found on line 1
  No link definition for link ID '1, 2' found on line 1
  No link definition for link ID '"1", "2"' found on line 1
  No link definition for link ID '"1", "2"' found on line 1
  No link definition for link ID '1, 2' found on line 1

Does this MR meet the acceptance criteria?

Conformity

• [-] I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• [-] I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• [-] This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.