refactor(CustomConfig): update placheolder for raw input

Author: philip-cline

lib/manager/components/deployment/CustomConfig.js

@@ -152,7 +152,7 @@ export default class CustomConfig extends Component<{
             <FormControl
               componentClass='textarea'
               style={{height: '125px'}}
-              placeholder='{"blah": true}'
+              placeholder='{"property": true}'
               onChange={e => this._onChangeConfig(e, CONFIG_OPTIONS.custom)}
               value={value} />
             {!validJSON && <HelpBlock>Must provide valid JSON string.</HelpBlock>}

lib/manager/components/deployment/CustomFileEditor.js

@@ -282,7 +282,7 @@ export default class CustomFileEditor extends Component<Props, {
               componentClass='textarea'
               disabled={!isEditing}
               style={{height: '125px'}}
-              placeholder='{"blah": true}'
+              placeholder='{"property": true}'
               onChange={this._onChangeContents}
               value={customFile.contents}
             />