Fix call to meter-list in measurements doc

-s is not an accepted argument.

Change-Id: I42567cf9187bb70665abfa335a8dcdefcc05c9fe
Closes-Bug: 1340775
Improves pipeline transformer documentation

Adds the Transformers section in the configuration documentation.
Describes each transformer's function, parameters and provides
an example.

Change-Id: I8f2218edcdd23fbd42a160afc5cc8e0af8d73af7
Merge "Fix call to meter-list in measurements doc"
Merge "Improves pipeline transformer documentation"