Fixed event listeners priority
Fixed event listeners priority (typos after review)
Replaced the priority paragraph with a note and a table
Fixed title underline
Updated title for the core cache warmers
Fixed title level consistency
feature #3719 Fixed event listeners priority (tony-co)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #3719).

Discussion
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Fixed event listeners priority

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | -

Commits
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47d4d4f Fixed title level consistency
1dbfd29 Updated title for the core cache warmers
a9d07a5 Fixed title underline
815f531 Replaced the priority paragraph with a note and a table
db2c002 Fixed event listeners priority (typos after review)
13b5645 Fixed event listeners priority