Made the following changes-

Author: gsreeja11

scipy/signal/_filter_design.py

@@ -788,11 +788,12 @@ def freqz_sos(sos, worN=512, whole=False, fs=2*pi):
 
     See Also
     --------
-    freqz, sosfilt
+    freqz, sosfilt, sosfreqz
 
     Notes
     -----
-    .. versionadded:: 0.19.0
+    .. versionadded:: 1.15.0
+    .. This function used to be called sosfreqz in versions in older versions (>=0.19.0)
 
     Examples
     --------
@@ -870,6 +871,7 @@ def sosfreqz(*args, **kwargs):
     .. warning:: This function is an alias, provided for backward
                  compatibility. New code should use the function
                  :func:`scipy.signal.freqz_sos`.
+                 This function became obsolete from version 1.15.0.
     """
     return freqz_sos(*args, **kwargs)
 

tools/refguide_check.py

@@ -102,7 +102,6 @@
     r'scipy\.special\.jn',  # alias for jv
     r'scipy\.ndimage\.sum',   # alias for sum_labels
     r'scipy\.linalg\.solve_lyapunov',  # deprecated name
-    r'scipy\.signal\.sosfreqz',  # alias for freqz_sos
     r'scipy\.stats\.contingency\.chi2_contingency',
     r'scipy\.stats\.contingency\.expected_freq',
     r'scipy\.stats\.contingency\.margins',