[docs] fix import

Author: tstack

docs/source/conf.py

@@ -232,7 +232,7 @@ def analyse_text(text):
     "sphinxcontrib.lightbox2",
     'sphinx_copybutton',
     'sphinx-jsonschema',
-    'sphinx-prompt',
+    'sphinx_prompt',
     '_ext.lnavlexer',
 ]