Remove backwards-compatible typos

Decreed in #3297 not to be a public API

sphinx/domains/cpp.py

@@ -1454,10 +1454,6 @@ class ASTFunctionParameter(ASTBase):
             self.arg.describe_signature(signode, mode, env, symbol=symbol)
 
 
-# backwards-compatible typo
-ASTFunctinoParameter = ASTFunctionParameter
-
-
 class ASTParametersQualifiers(ASTBase):
     def __init__(self, args, volatile, const, refQual, exceptionSpec, override,
                  final, initializer):
@@ -2291,10 +2287,6 @@ class ASTDeclaratorNameParamQual(ASTBase):
             self.paramQual.describe_signature(signode, mode, env, symbol)
 
 
-# backwards-compatible typo
-ASTDecleratorNameParamQual = ASTDeclaratorNameParamQual
-
-
 class ASTInitializer(ASTBase):
     def __init__(self, value):
         # type: (unicode) -> None
@@ -3972,9 +3964,6 @@ class DefinitionParser(object):
             header = "Error in declarator or parameters and qualifiers"
             raise self._make_multi_error(prevErrors, header)
 
-    # backwards-compatible typo
-    _parse_declerator = _parse_declarator
-
     def _parse_initializer(self, outer=None):
         # type: (unicode) -> ASTInitializer
         self.skip_ws()