Change response code quoting style from " to ' for consistency

Author: hkosova

examples/v3.0/api-with-examples.yaml

@@ -8,7 +8,7 @@ paths:
       operationId: listVersionsv2
       summary: List API versions
       responses:
-        "200":
+        '200':
           description: |-
             200 response
           content:
@@ -41,7 +41,7 @@ paths:
                         }
                     ]
                  }
-        "300":
+        '300':
           description: |-
             300 response
           content:
@@ -80,7 +80,7 @@ paths:
       operationId: getVersionDetailsv2
       summary: Show API version details
       responses:
-        "200":
+        '200':
           description: |-
             200 response
           content:
@@ -125,7 +125,7 @@ paths:
                       ]
                     }
                   }
-        "203":
+        '203':
           description: |-
             203 response
           content:

examples/v3.0/uber.yaml

@@ -32,7 +32,7 @@ paths:
       tags: 
         - Products
       responses:  
-        "200":
+        '200':
           description: An array of products
           content:
             application/json:
@@ -80,7 +80,7 @@ paths:
       tags: 
         - Estimates
       responses:  
-        "200":
+        '200':
           description: An array of price estimates by product
           content:
             application/json:
@@ -127,7 +127,7 @@ paths:
       tags: 
         - Estimates
       responses:  
-        "200":
+        '200':
           description: An array of products
           content:
             application/json:
@@ -148,7 +148,7 @@ paths:
       tags: 
         - User
       responses:
-        "200":
+        '200':
           description: Profile information for a user
           content:
             application/json:
@@ -180,7 +180,7 @@ paths:
       tags: 
         - User
       responses:
-        "200":
+        '200':
           description: History information for the given user
           content:
             application/json: