fix param_change swagger docs (#4240)

Update /gov/proposals/param_change POST endpoint docs.

client/lcd/swagger-ui/swagger.yaml

@@ -1122,49 +1122,51 @@ paths:
           description: Invalid query parameters
         500:
           description: Internal Server Error
-/gov/proposals/param_change:
-  post:
-    summary: Generate a parameter change proposal transaction
-    description: Generate a parameter change proposal transaction
-    consumes:
-      - application/json
-    produces:
-      - application/json
-    tags:
-      - ICS22
-    parameters:
-      - description: The parameter change proposal body that contains all parameter changes
-        name: post_proposal_body
-        in: body
-        required: true
-        schema:
-          type: object
-          properties:
-            base_req:
-              $ref: "#/definitions/BaseReq"
-            title:
-              type: string
-            description:
-              type: string
-            proposer:
-              $ref: "#/definitions/Address"
-            deposit:
-              type: array
-              items:
-                $ref: "#/definitions/Coin"
-            changes:
-              type: array
-              items:
-                $ref: "#/definitions/ParamChange"
-    responses:
-      200:
-        description: The transaction was succesfully generated
-        schema:
-          $ref: "#/definitions/StdTx"
-      400:
-        description: Invalid proposal body
-      500:
-        description: Internal Server Error
+  /gov/proposals/param_change:
+    post:
+      summary: Generate a parameter change proposal transaction
+      description: Generate a parameter change proposal transaction
+      consumes:
+        - application/json
+      produces:
+        - application/json
+      tags:
+        - ICS22
+      parameters:
+        - description: The parameter change proposal body that contains all parameter changes
+          name: post_proposal_body
+          in: body
+          required: true
+          schema:
+            type: object
+            properties:
+              base_req:
+                $ref: "#/definitions/BaseReq"
+              title:
+                type: string
+                x-example: 'Param Change'
+              description:
+                type: string
+                x-example: 'Update max validators'
+              proposer:
+                $ref: "#/definitions/Address"
+              deposit:
+                type: array
+                items:
+                  $ref: "#/definitions/Coin"
+              changes:
+                type: array
+                items:
+                  $ref: "#/definitions/ParamChange"
+      responses:
+        200:
+          description: The transaction was succesfully generated
+          schema:
+            $ref: "#/definitions/StdTx"
+        400:
+          description: Invalid proposal body
+        500:
+          description: Internal Server Error
   /gov/proposals/{proposalId}:
     get:
       summary: Query a proposal
@@ -2019,23 +2021,6 @@ definitions:
           sequence:
             type: string
             example: "0"
-  KeyOutput:
-    type: object
-    properties:
-      name:
-        type: string
-        example: Main Account
-      address:
-        type: string
-        example: cosmos1depk54cuajgkzea6zpgkq36tnjwdzv4afc3d27
-      pub_key:
-        type: string
-        example: "cosmospub1addwnpepqtqc88gfdxyzcdm2eqr3tnlnxnelyqehy8k95qzgwdz5zccdft9rq5q7wj2"
-      type:
-        type: string
-        example: local
-      seed:
-        type: string
   BlockID:
     type: object
     properties:
@@ -2054,7 +2039,7 @@ definitions:
     properties:
       chain_id:
         type: string
-        example: gaia-2
+        example: cosmoshub-2
       height:
         type: number
         example: 1
@@ -2412,15 +2397,16 @@ definitions:
         type: string
   ParamChange:
     type: object
+    properties:
       subspace:
         type: string
-        description: The parameter module subspace
+        example: "staking"
       key:
         type: string
-        description: The parameter key
+        example: "MaxValidators"
       subkey:
         type: string
-        description: An optional parameter subkey
+        example: ""
       value:
         type: string
-        description: The new parameter value
+        example: "105"