Fix docs about outputs and fieldpass/fielddrop

This has been allowed since 1.1.0

docs/CONFIGURATION.md

@@ -153,11 +153,11 @@ The inverse of `namepass`.  If a match is found the point is discarded. This
 is tested on points after they have passed the `namepass` test.
 * **fieldpass**:
 An array of glob pattern strings.  Only fields whose field key matches a
-pattern in this list are emitted.  Not available for outputs.
+pattern in this list are emitted.
 * **fielddrop**:
 The inverse of `fieldpass`.  Fields with a field key matching one of the
 patterns will be discarded from the point.  This is tested on points after
-they have passed the `fieldpass` test.  Not available for outputs.
+they have passed the `fieldpass` test.
 * **tagpass**:
 A table mapping tag keys to arrays of glob pattern strings.  Only points
 that contain a tag key in the table and a tag value matching one of its