Fix Warnings generated while building of HTML docu

Same ID have been set to reference different RST blocks.
To avoid this, I added the prefix 'archi_' within ID referencing
architecture RST block.

Bad indentation warnings have been fixed.

Change-Id: I17f43f2f564ffd83fd5c345aed96fad06ee56b1d
Partial-Bug: #1522034

watcher/doc.py

@@ -61,9 +61,7 @@ class WatcherTerm(rst.Directive):
         cls_path = self.arguments[0]
 
         try:
-            module_name, obj_name = cls_path.rsplit(".", 1)
-            module = importlib.import_module(module_name)
-            cls = getattr(module, obj_name)
+            cls = importlib.import_module(cls_path)
         except Exception as exc:
             raise self.error(exc)