Fix warnings - `Inline substitution_reference start-string without en…

…d-string.`

This escapes vertical bars in bash tree output in pydocs but doesnt fix rendering in html.

docs/conf.in.py

@@ -31,6 +31,7 @@
 import re
 import subprocess
 import sys
+from typing import List
 
 
 def get_git_short_hash():
@@ -270,8 +271,22 @@ def skip(app, what, name, obj, would_skip, options):
     return would_skip
 
 
+def escape_vertical_bars(app, what, name, obj, options, lines: List[str]):
+    # Note - Latex docs also contains Vertical Bar, so we
+    # apply this filtering only to specific classes.
+    if name  in [
+        "open3d.data.RedwoodIndoorLivingRoom1",
+        "open3d.data.RedwoodIndoorLivingRoom2",
+        "open3d.data.RedwoodIndoorOffice1",
+        "open3d.data.RedwoodIndoorOffice2",
+    ]:
+        for index in range(len(lines)):
+            lines[index] = lines[index].replace("|", "\|")
+
+
 def setup(app):
     app.connect("autodoc-skip-member", skip)
+    app.connect("autodoc-process-docstring", escape_vertical_bars)
     # Add Google analytics
     app.add_js_file("https://www.googletagmanager.com/gtag/js?id=G-3TQPKGV6Z3",
                     **{'async': 'async'})