Merge pull request #1090 from samuelgarcia/doc_fix

fix doc

Author: samuelgarcia

.readthedocs.yaml

@@ -9,7 +9,7 @@ sphinx:
    configuration: doc/source/conf.py
 
 python:
-   install:
-     - method: pip
-        path: .   
-     - requirements: doc/requirements_docs.txt 
+  install:
+    - method: pip
+      path: .
+     - requirements: doc/requirements_docs.txt