deduplicate admin /_expvar and metrics /_expvar

fixup text

Author: torcolvin

docs/api/admin.yaml

@@ -132,7 +132,8 @@ paths:
   '/{keyspace}/':
     $ref: './paths/admin/keyspace-.yaml'
   /_expvar:
-    $ref: ./paths/admin/_expvar.yaml
+    # use the same path as for metrics
+    $ref: ./paths/metric/_expvar.yaml
   /:
     $ref: ./paths/admin/-.yaml
   /_ping:

docs/api/paths/admin/_expvar.yaml

@@ -26,7 +26,7 @@ get:
           Successfully returned statistics.
           For details, see [JSON Metrics](stats-monitoring-json.html).
       content:
-        application/javascript:
+        application/json:
           schema:
             $ref: ../../components/schemas.yaml#/ExpVars
   operationId: get__expvar

docs/api/paths/metric/_expvar.yaml

@@ -6,7 +6,7 @@
 # software will be governed by the Apache License, Version 2.0, included in
 # the file licenses/APL2.txt.
 get:
-  summary: Debugging/monitoring runtime stats in Prometheus Exposition format
+  summary: Get debugging and monitoring runtime stats in Prometheus Exposition format
   description: |-
     Returns Sync Gateway statistics and other runtime variables in Prometheus Exposition format.