Remove deprecated `LaTeXTranslator.docclasses` attribute (#11382)

CHANGES

@@ -26,6 +26,8 @@ Incompatible changes
 * #11379: Make the ``env`` argument to ``Builder`` subclasses required.
 * #11380: autosummary: Always emit grouped import exceptions.
 * #11381: Remove deprecated ``style`` key for HTML templates.
+* #11382: Remove deprecated ``sphinx.writers.latex.LaTeXTranslator.docclasses``
+  attribute.
 
 Deprecated
 ----------

sphinx/writers/latex.py

@@ -7,7 +7,6 @@ docutils sandbox.
 from __future__ import annotations
 
 import re
-import warnings
 from collections import defaultdict
 from os import path
 from typing import TYPE_CHECKING, Any, Iterable, cast
@@ -16,7 +15,6 @@ from docutils import nodes, writers
 from docutils.nodes import Element, Node, Text
 
 from sphinx import addnodes, highlighting
-from sphinx.deprecation import RemovedInSphinx70Warning
 from sphinx.domains import IndexEntry
 from sphinx.domains.std import StandardDomain
 from sphinx.errors import SphinxError
@@ -2121,13 +2119,6 @@ class LaTeXTranslator(SphinxTranslator):
     def depart_math_reference(self, node: Element) -> None:
         pass
 
-    @property
-    def docclasses(self) -> tuple[str, str]:
-        """Prepends prefix to sphinx document classes"""
-        warnings.warn('LaTeXWriter.docclasses() is deprecated.',
-                      RemovedInSphinx70Warning, stacklevel=2)
-        return ('howto', 'manual')
-
 
 # FIXME: Workaround to avoid circular import
 # refs: https://github.com/sphinx-doc/sphinx/issues/5433