message: update syntax of environment variables
diff: @@ -53,8 +53,8 @@ export class SlackAdapter extends BotAdapter {
  * Use with Botkit:
  *```javascript
  * const adapter = new SlackAdapter({
  - * clientSigningSecret: process.env.SLACK_SECRET,
  - * botToken: process.env.SLACK_TOKEN
  + * clientSigningSecret: process.env.CLIENT_SIGNING_SECRET,
  + * botToken: process.env.BOT_TOKEN
  * });
  * const controller = new Botkit({
  * adapter: adapter,
  @@ -65,8 +65,8 @@ export class SlackAdapter extends BotAdapter {
  * Use with BotBuilder:
  *```javascript
  * const adapter = new SlackAdapter({
  - * clientSigningSecret: process.env.SLACK_SECRET,
  - * botToken: process.env.SLACK_TOKEN
  + * clientSigningSecret: process.env.CLIENT_SIGNING_SECRET,
  + * botToken: process.env.BOT_TOKEN
  * });
  * // set up restify...
  * const server = restify.createServer();
  @@ -81,9 +81,9 @@ export class SlackAdapter extends BotAdapter {
  * Use in "Slack app" multi-team mode:
  * ```javascript
  * const adapter = new SlackAdapter({
  - * clientSigningSecret: process.env.SLACK_SECRET,
  - * clientId: process.env.CLIENTID, // oauth client id
  - * clientSecret: process.env.CLIENTSECRET, // oauth client secret
  + * clientSigningSecret: process.env.CLIENT_SIGNING_SECRET,
  + * clientId: process.env.CLIENT_ID, // oauth client id
  + * clientSecret: process.env.CLIENT_SECRET, // oauth client secret
  * scopes: ['bot'], // oauth scopes requested
  * redirectUri: process.env.REDIRECT_URI, // url to redirect post login defaults to `https://<mydomain>/install/auth`
  * getTokenForTeam: async(team_id) => Promise<string>, // function that returns a token based on team id
  