Remove Pulse library URL renaming in docs (#13107) (#13132)

(cherry picked from commit c5e9f8a)

Co-authored-by: Eric Arellano <14852634+Eric-Arellano@users.noreply.github.com>

docs/conf.py

@@ -114,23 +114,6 @@
 autosummary_generate = True
 autosummary_generate_overwrite = False
 
-# The pulse library contains some names that differ only in capitalization, during the changeover
-# surrounding SymbolPulse.  Since these resolve to autosummary filenames that also differ only in
-# capitalization, this causes problems when the documentation is built on an OS/filesystem that is
-# enforcing case-insensitive semantics.  This setting defines some custom names to prevent the clash
-# from happening.
-autosummary_filename_map = {
-    "qiskit.pulse.library.Constant": "qiskit.pulse.library.Constant_class.rst",
-    "qiskit.pulse.library.Sawtooth": "qiskit.pulse.library.Sawtooth_class.rst",
-    "qiskit.pulse.library.Triangle": "qiskit.pulse.library.Triangle_class.rst",
-    "qiskit.pulse.library.Cos": "qiskit.pulse.library.Cos_class.rst",
-    "qiskit.pulse.library.Sin": "qiskit.pulse.library.Sin_class.rst",
-    "qiskit.pulse.library.Gaussian": "qiskit.pulse.library.Gaussian_class.rst",
-    "qiskit.pulse.library.Drag": "qiskit.pulse.library.Drag_class.rst",
-    "qiskit.pulse.library.Square": "qiskit.pulse.library.Square_fun.rst",
-    "qiskit.pulse.library.Sech": "qiskit.pulse.library.Sech_fun.rst",
-}
-
 # We only use Google-style docstrings, and allowing Napoleon to parse Numpy-style docstrings both
 # slows down the build (a little) and can sometimes result in _regular_ section headings in
 # module-level documentation being converted into surprising things.