Use more consistent operationId

Author: bikmazefe

doc/compiled.json

@@ -18605,7 +18605,7 @@
       "post": {
         "summary": "Create comparison (async.)",
         "description": "Create a branch comparison asynchronously.\n",
-        "operationId": "branch/create_comparison",
+        "operationId": "branch/comparison/create",
         "tags": [
           "Branches"
         ],

paths/branches/create_comparison.yaml

@@ -2,7 +2,7 @@
 summary: Create comparison (async.)
 description: |
   Create a branch comparison asynchronously.
-operationId: branch/create_comparison
+operationId: branch/comparison/create
 tags:
 - Branches
 parameters: