fix(cloudtrace): update the API

#### cloudtrace:v2

The following keys were changed:
- schemas.Span.description

discovery/cloudtrace-v2.json

@@ -181,7 +181,7 @@
       }
     }
   },
-  "revision": "20230126",
+  "revision": "20230118",
   "rootUrl": "https://cloudtrace.googleapis.com/",
   "schemas": {
     "Annotation": {
@@ -362,7 +362,7 @@
       "type": "object"
     },
     "Span": {
-      "description": "A span represents a single operation within a trace. Spans can be nested to form a trace tree. Often, a trace contains a root span that describes the end-to-end latency, and one or more subspans for its sub-operations. A trace can also contain multiple root spans, or none at all. Spans do not need to be contiguous. There might be gaps or overlaps between spans in a trace.",
+      "description": "A span represents a single operation within a trace. Spans can be nested to form a trace tree. Often, a trace contains a root span that describes the end-to-end latency, and one or more subspans for its sub-operations. A trace can also contain multiple root spans, or none at all. Spans do not need to be contiguous—there might be gaps or overlaps between spans in a trace.",
       "id": "Span",
       "properties": {
         "attributes": {

src/apis/cloudtrace/v2.ts

@@ -249,7 +249,7 @@ export namespace cloudtrace_v2 {
     module?: Schema$TruncatableString;
   }
   /**
-   * A span represents a single operation within a trace. Spans can be nested to form a trace tree. Often, a trace contains a root span that describes the end-to-end latency, and one or more subspans for its sub-operations. A trace can also contain multiple root spans, or none at all. Spans do not need to be contiguous. There might be gaps or overlaps between spans in a trace.
+   * A span represents a single operation within a trace. Spans can be nested to form a trace tree. Often, a trace contains a root span that describes the end-to-end latency, and one or more subspans for its sub-operations. A trace can also contain multiple root spans, or none at all. Spans do not need to be contiguous—there might be gaps or overlaps between spans in a trace.
    */
   export interface Schema$Span {
     /**