Backport PR #62313: DOC: Fix NaT and NA API docs

Author: meet-vasita

doc/source/reference/missing_value.rst

@@ -11,14 +11,12 @@ NA is the way to represent missing values for nullable dtypes (see below):
 
 .. autosummary::
    :toctree: api/
-   :template: autosummary/class_without_autosummary.rst
 
    NA
 
 NaT is the missing value for timedelta and datetime data (see below):
 
 .. autosummary::
    :toctree: api/
-   :template: autosummary/class_without_autosummary.rst
 
    NaT

pandas/_libs/missing.pyx

@@ -371,6 +371,7 @@ class NAType(C_NAType):
     >>> True | pd.NA
     True
     """
+    __module__ = "pandas"
 
     _instance = None
 

pandas/_libs/tslibs/nattype.pyx

@@ -341,6 +341,8 @@ class NaTType(_NaT):
     1         NaT
     """
 
+    __module__ = "pandas"
+
     def __new__(cls):
         cdef _NaT base