message: update date format
diff: @@ -1858,9 +1858,9 @@ Resource provider naming in path SHOULD follow the pascal case. (e.g. Microsoft.
  For more detail, pls refer to https://github.com/microsoft/api-guidelines/blob/vNext/Guidelines.md#172-casing
  -**CreatedAt**: 2/18/2020
  +**CreatedAt**: February 18, 2020
  -**LastModifiedAt**: 2/18/2020
  +**LastModifiedAt**: February 18, 2020
  **How to fix the violation**:
  @@ -1914,9 +1914,9 @@ Resource type or other identifiers (include: namespace, entityTypes) SHOULD foll
  For more detail, pls refer to https://github.com/microsoft/api-guidelines/blob/vNext/Guidelines.md#172-casing
  -**CreatedAt**: 2/18/2020
  +**CreatedAt**: February 18, 2020
  -**LastModifiedAt**: 2/18/2020
  +**LastModifiedAt**: February 18, 2020
  **How to fix the violation**:
  @@ -1966,9 +1966,9 @@ Links: [Index](#index) | [Error vs. Warning](#error-vs-warning) | [Automated Rul
  **Description** : Case-insensitive value in enum mean the same value.
  -**CreatedAt**: 2/18/2020
  +**CreatedAt**: February 18, 2020
  -**LastModifiedAt**: 2/18/2020
  +**LastModifiedAt**: February 18, 2020
  **How to fix the violation**:
  @@ -2009,9 +2009,9 @@ Links: [Index](#index) | [Error vs. Warning](#error-vs-warning) | [Automated Rul
  **Description** : Enum must define its type object or string. If not it will block SDK generation.
  -**CreatedAt**: 2/18/2020
  +**CreatedAt**: February 18, 2020
  -**LastModifiedAt**: 2/18/2020
  +**LastModifiedAt**: February 18, 2020
  **How to fix the violation**:
  @@ -2066,9 +2066,9 @@ Links: [Index](#index) | [Error vs. Warning](#error-vs-warning) | [Automated Rul
  **Description** : Empty value is not allowed in enum value and meanless.
  -**CreatedAt**: 2/18/2020
  +**CreatedAt**: February 18, 2020
  -**LastModifiedAt**: 2/18/2020
  +**LastModifiedAt**: February 18, 2020
  **How to fix the violation**:
  @@ -2094,4 +2094,5 @@ Valid:
  ]
  ```
  +
  Links: [Index](#index) | [Error vs. Warning](#error-vs-warning) | [Automated Rules](#automated-rules) | [ARM](#arm-violations): [Errors](#arm-errors) or [Warnings](#arm-warnings) | [SDK](#sdk-violations): [Errors](#sdk-errors) or [Warnings](#sdk-warnings)
  