Document deprecation rationale for executeChangeLogCommand in AbstractChangeLogCommand #1344

New feature, improvement proposal

Summary:
The method executeChangeLogCommand in AbstractChangeLogCommand is marked as
deprecated but lacks Javadoc explaining why it is deprecated or how
implementations should migrate.

Current behavior:
The method is annotated with @deprecated but does not document the
deprecation rationale or any recommended alternative.

Expected behavior:
Deprecated APIs should document the reason for deprecation and indicate
whether a replacement exists or if the method is kept for backward
compatibility.

Scope:
Documentation-only changes in
maven-scm-api/src/main/java/org/apache/maven/scm/command/changelog/AbstractChangeLogCommand.java

Notes:
No functional behavior changes are expected.

I can work on this if it sounds reasonable.