minor #11032 remove obsolete internal references (OskarStark)

This PR was merged into the 4.2 branch.

Discussion
----------

remove obsolete internal references

One of them was used in the 3.4 branch, but no more usage in 4.2

Commits
-------

971adde remove obsolete internal references

Author: javiereguiluz

best_practices/configuration.rst

@@ -6,8 +6,6 @@ and security credentials) and different environments (development, production).
 That's why Symfony recommends that you split the application configuration into
 three parts.
 
-.. _config-parameters.yml:
-
 Infrastructure-Related Configuration
 ------------------------------------
 
@@ -53,8 +51,6 @@ To override these variables with machine-specific or sensitive values, create a
     environment variables, exposing sensitive information such as the database
     credentials.
 
-.. _best-practices-canonical-parameters:
-
 Canonical Parameters
 ~~~~~~~~~~~~~~~~~~~~