etcdserverpb: rework documentation for range request

Documentation/dev-guide/api_reference_v3.md

@@ -634,7 +634,7 @@ Empty field.
 | Field | Description | Type |
 | ----- | ----------- | ---- |
 | key | default, no sorting lowest target value first highest target value first key is the first key for the range. If range_end is not given, the request only looks up key. | bytes |
-| range_end | range_end is the upper bound on the requested range [key, range_end). If range_end is '\0', the range is all keys >= key. If the range_end is one bit larger than the given key, then the range requests get the all keys with the prefix (the given key). If both key and range_end are '\0', then range requests returns all keys. | bytes |
+| range_end | range_end is the upper bound on the requested range [key, range_end). If range_end is '\0', the range is all keys >= key. If range_end is key plus one (e.g., "aa"+1 == "ab", "a\xff"+1 == "b"), then the range request gets all keys prefixed with key. If both key and range_end are '\0', then the range request returns all keys. | bytes |
 | limit | limit is a limit on the number of keys returned for the request. | int64 |
 | revision | revision is the point-in-time of the key-value store to use for the range. If revision is less or equal to zero, the range is over the newest key-value store. If the revision has been compacted, ErrCompacted is returned as a response. | int64 |
 | sort_order | sort_order is the order for returned sorted results. | SortOrder |

Documentation/dev-guide/apispec/swagger/rpc.swagger.json

@@ -1859,7 +1859,7 @@
         "range_end": {
           "type": "string",
           "format": "byte",
-          "description": "range_end is the upper bound on the requested range [key, range_end).\nIf range_end is '\\0', the range is all keys \u003e= key.\nIf the range_end is one bit larger than the given key,\nthen the range requests get the all keys with the prefix (the given key).\nIf both key and range_end are '\\0', then range requests returns all keys."
+          "description": "range_end is the upper bound on the requested range [key, range_end).\nIf range_end is '\\0', the range is all keys \u003e= key.\nIf range_end is key plus one (e.g., \"aa\"+1 == \"ab\", \"a\\xff\"+1 == \"b\"),\nthen the range request gets all keys prefixed with key.\nIf both key and range_end are '\\0', then the range request returns all keys."
         },
         "limit": {
           "type": "string",

etcdserver/etcdserverpb/rpc.pb.go

@@ -228,9 +228,9 @@ type RangeRequest struct {
 	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	// range_end is the upper bound on the requested range [key, range_end).
 	// If range_end is '\0', the range is all keys >= key.
-	// If the range_end is one bit larger than the given key,
-	// then the range requests get the all keys with the prefix (the given key).
-	// If both key and range_end are '\0', then range requests returns all keys.
+	// If range_end is key plus one (e.g., "aa"+1 == "ab", "a\xff"+1 == "b"),
+	// then the range request gets all keys prefixed with key.
+	// If both key and range_end are '\0', then the range request returns all keys.
 	RangeEnd []byte `protobuf:"bytes,2,opt,name=range_end,json=rangeEnd,proto3" json:"range_end,omitempty"`
 	// limit is a limit on the number of keys returned for the request.
 	Limit int64 `protobuf:"varint,3,opt,name=limit,proto3" json:"limit,omitempty"`

etcdserver/etcdserverpb/rpc.proto

@@ -352,9 +352,9 @@ message RangeRequest {
   bytes key = 1;
   // range_end is the upper bound on the requested range [key, range_end).
   // If range_end is '\0', the range is all keys >= key.
-  // If the range_end is one bit larger than the given key,
-  // then the range requests get the all keys with the prefix (the given key).
-  // If both key and range_end are '\0', then range requests returns all keys.
+  // If range_end is key plus one (e.g., "aa"+1 == "ab", "a\xff"+1 == "b"),
+  // then the range request gets all keys prefixed with key.
+  // If both key and range_end are '\0', then the range request returns all keys.
   bytes range_end = 2;
   // limit is a limit on the number of keys returned for the request.
   int64 limit = 3;