[doc] Slight rephrasings

Author: mpsonntag

docs/data_model.md

@@ -1,6 +1,6 @@
 # The odML data model
 
-Data exchange requires that also annotations, metadata, are
+Data exchange requires that annotations, metadata, are also
 shared. In oder to allow interoperability both a common
 (meta) data model, the format in which the metadata are exchanged, and
 a common terminology are required.

docs/index.md

@@ -52,7 +52,7 @@ discussed and shared at the
 If you have created your own templates that others might find useful, 
 you are encouraged to share your templates via this repository.
 
-Already available odML templates can be browsed and imported from
+Currently available odML templates can be browsed and imported from
 [templates.g-node.org](https://templates.g-node.org).