Fixes PhpDoc

[adriendupuis]

Question	Answer
JIRA issue	IBX-4929
Type	bug
Target Ibexa version	v4.6
BC breaks	no

• A dollar sign was missing from phpDoc's property declaration (which is preferred to the PHP property declaration by phpDocumentor);
• Hide some PHPStan 's specific TKey and TValue from phpDocumentor output.

Checklist:

• Provided PR description.
• Tested the solution manually.
• Provided automated test coverage.
• Checked that target branch is set correctly (main for features, the oldest supported for bugs).
• Ran PHP CS Fixer for new PHP code (use $ composer fix-cs).
• Asked for a review (ping @ibexa/engineering).

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[adamwojs]

@adriendupuis We need rebase here

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud