remove Pyrex references in comments

Cython/Compiler/Builtin.py

 #
-#   Pyrex - Builtin Definitions
+#   Builtin Definitions
 #
 
 from Symtab import BuiltinScope, StructOrUnionScope

Cython/Compiler/Code.py

 # cython: language_level = 3, py2_import=True
 #
-#   Pyrex - Code output module
+#   Code output module
 #
 
 import cython

Cython/Compiler/Errors.py

 #
-#   Pyrex - Errors
+#   Errors
 #
 
 import sys

Cython/Compiler/ExprNodes.py

 #
-#   Pyrex - Parse tree nodes for expressions
+#   Parse tree nodes for expressions
 #
 
 import cython

Cython/Compiler/ModuleNode.py

 #
-#   Pyrex - Module parse tree node
+#   Module parse tree node
 #
 
 import cython

Cython/Compiler/Naming.py

 #
-#   Pyrex - C naming conventions
+#   C naming conventions
 #
 #
 #   Prefixes for generating C names.

Cython/Compiler/Nodes.py

-
 #
-#   Pyrex - Parse tree nodes
+#   Parse tree nodes
 #
+
 import cython
 cython.declare(sys=object, os=object, time=object, copy=object,
                Builtin=object, error=object, warning=object, Naming=object, PyrexTypes=object,
@@ -415,7 +415,7 @@ class CDeclaratorNode(Node):
 
 
 class CNameDeclaratorNode(CDeclaratorNode):
-    #  name    string             The Pyrex name being declared
+    #  name    string             The Cython name being declared
     #  cname   string or None     C name, if specified
     #  default ExprNode or None   the value assigned on declaration
 

Cython/Compiler/Parsing.py

 # cython: auto_cpdef=True, infer_types=True, language_level=3, py2_import=True
 #
-#   Pyrex Parser
+#   Parser
 #
 
 # This should be done automatically

Cython/Compiler/PyrexTypes.py

 #
-#   Pyrex - Types
+#   Cython/Python language types
 #
 
 from Code import UtilityCode
@@ -10,7 +10,7 @@ from Errors import error
 
 class BaseType(object):
     #
-    #  Base class for all Pyrex types including pseudo-types.
+    #  Base class for all Cython types including pseudo-types.
 
     def can_coerce_to_pyobject(self, env):
         return False
@@ -35,7 +35,7 @@ class BaseType(object):
 
 class PyrexType(BaseType):
     #
-    #  Base class for all Pyrex types.
+    #  Base class for all Cython types
     #
     #  is_pyobject           boolean     Is a Python object type
     #  is_extension_type     boolean     Is a Python extension type
@@ -72,7 +72,7 @@ class PyrexType(BaseType):
     #      'DL_IMPORT', and will be added to the base type part of
     #      the declaration.
     #    * If pyrex = 1, this is for use in a 'cdef extern'
-    #      statement of a Pyrex include file.
+    #      statement of a Cython include file.
     #
     #  assignable_from(src_type)
     #    Tests whether a variable of this type can be

Cython/Compiler/Symtab.py

@@ -1577,7 +1577,7 @@ class ClassScope(Scope):
     #  Abstract base class for namespace of
     #  Python class or extension type.
     #
-    #  class_name     string   Pyrex name of the class
+    #  class_name     string   Python name of the class
     #  scope_prefix   string   Additional prefix for names
     #                          declared in the class
     #  doc    string or None   Doc string

Cython/Compiler/TypeSlots.py

 #
-#   Pyrex - Tables describing slots in the type object
+#   Tables describing slots in the CPython type object
 #   and associated know-how.
 #