Fix docs source linking

Co-authored-by: Oriol Abril-Pla <[email protected]>

Author: ricardoV94

doc/conf.py

@@ -1,6 +1,8 @@
 import os
 import inspect
 import sys
+import warnings
+
 import pytensor
 from pathlib import Path
 
@@ -243,7 +245,7 @@ def find_source():
             obj = getattr(obj, part)
 
         fn = Path(inspect.getsourcefile(obj))
-        fn = fn.relative_to(Path(__file__).parent)
+        fn = fn.relative_to(Path(pytensor.__file__).parent)
         source, lineno = inspect.getsourcelines(obj)
         return fn, lineno, lineno + len(source) - 1
 
@@ -252,6 +254,7 @@ def find_source():
     try:
         filename = "pytensor/%s#L%d-L%d" % find_source()
     except Exception:
+        warnings.warn(f"Could not find source code for {domain}:{info}")
         filename = info["module"].replace(".", "/") + ".py"
     import subprocess