Fixing more links

[ThomasLandauer]

The first two I missed in #9151
The third is probably older.
Shouldn't the chapter name be displayed as link text by default?? Are you sure that everything is set up correctly with the parser?

[ThomasLandauer]

@SenseException I just wanted to start changing the order in the table (what I announced in #9131), but the overall structure of the page seems flawed:
Load ClassMetadata Event is a top (!) level heading and "SchemaTool Events" too. And only the former events are included in the table, the latter aren't. I see two ways to fix this:

1. Include all events in the table. Merge all text starting at Implementing Event Listeners into one section (called something like "List of Events").
2. Remove those "special" events (onClassMetadataNotFound, postGenerateSchemaTable, etc.) from the table, and leave their text sections where they are. But then move the table closer to "Implementing Event Listeners".

I have no preference, since I still haven't fully understood how all those topics belong together - that's why I started the "overview/table project" ;-)

[SenseException]

@ThomasLandauer Thanks again. Could you please combine your link-PRs into one PR instead of creating multiple ones? Maybe you could use this one and close the others.

[ThomasLandauer]

Just double-checked: They all have specific comments/questions :-(
I usually don't mix unrelated stuff (learned that from symfony-docs ;-) cause when one is problematic, at least the other can be merged in the meantime...
But I'll try to improve in the future :-)

[SenseException]

I don't want to have multiple commits with the same type of additions. In case of the links we can have them in one PR.

[ThomasLandauer]

OK. I integrated two, and closed one.