Remove no longer relevant comment

pyproject.toml

@@ -66,7 +66,7 @@ docs = [
     "nbsphinx>=0.8.9",
     "PyQt5>=5.15.0", # pyqtgraph examples
     "pyqtgraph>=0.11.0", # pyqtgraph examples
-    "sphinx>=4.5.0,<9.0.0",  # current version of nbsphinx does not work with sphinx 8
+    "sphinx>=4.5.0,<9.0.0",
     "slack-sdk>=3.4.2", # slack docs
     "requests", # slack docs
     "urllib3", # slack docs