add hint text for search exclusion (#3432)

components/search_hint/__snapshots__/search_hint.test.jsx.snap

@@ -10,7 +10,7 @@ exports[`components/SearchHint should match snapshot, with title 1`] = `
  />
  </h4>
  <InjectIntl(FormattedMarkdownMessage)
- defaultMessage="* Use **\\"quotation marks\\"** to search for phrases\\\\n* Use **from:** to find posts from specific users and **in:** to find posts in specific channels\\\\n* Use **on:** to find posts on a specific date\\\\n* Use **before:** to find posts before a specific date\\\\n* Use **after:** to find posts after a specific date"
+ defaultMessage="* Use **\\"quotation marks\\"** to search for phrases\\\\n* Use **from:** to find posts from specific users and **in:** to find posts in specific channels\\\\n* Use **on:** to find posts on a specific date\\\\n* Use **before:** to find posts before a specific date\\\\n* Use **after:** to find posts after a specific date\\\\n* Use **dash** \\"-\\" to exclude search terms and modifiers"
  id="search_bar.usage.tips"
  />
 </Fragment>
@@ -19,7 +19,7 @@ exports[`components/SearchHint should match snapshot, with title 1`] = `
 exports[`components/SearchHint should match snapshot, without title 1`] = `
 <Fragment>
  <InjectIntl(FormattedMarkdownMessage)
- defaultMessage="* Use **\\"quotation marks\\"** to search for phrases\\\\n* Use **from:** to find posts from specific users and **in:** to find posts in specific channels\\\\n* Use **on:** to find posts on a specific date\\\\n* Use **before:** to find posts before a specific date\\\\n* Use **after:** to find posts after a specific date"
+ defaultMessage="* Use **\\"quotation marks\\"** to search for phrases\\\\n* Use **from:** to find posts from specific users and **in:** to find posts in specific channels\\\\n* Use **on:** to find posts on a specific date\\\\n* Use **before:** to find posts before a specific date\\\\n* Use **after:** to find posts after a specific date\\\\n* Use **dash** \\"-\\" to exclude search terms and modifiers"
  id="search_bar.usage.tips"
  />
 </Fragment>

components/search_hint/search_hint.jsx

@@ -25,7 +25,7 @@ export default class SearchHint extends PureComponent {
  }
  <FormattedMarkdownMessage
  id='search_bar.usage.tips'
- defaultMessage='* Use **"quotation marks"** to search for phrases\n* Use **from:** to find posts from specific users and **in:** to find posts in specific channels\n* Use **on:** to find posts on a specific date\n* Use **before:** to find posts before a specific date\n* Use **after:** to find posts after a specific date'
+ defaultMessage='* Use **"quotation marks"** to search for phrases\n* Use **from:** to find posts from specific users and **in:** to find posts in specific channels\n* Use **on:** to find posts on a specific date\n* Use **before:** to find posts before a specific date\n* Use **after:** to find posts after a specific date\n* Use **dash** "-" to exclude search terms and modifiers'
  />
  </React.Fragment>
  );

i18n/en.json

@@ -2878,7 +2878,7 @@
  "save_button.saving": "Saving",
  "search_bar.clear": "Clear search query",
  "search_bar.search": "Search",
- "search_bar.usage.tips": "* Use **\"quotation marks\"** to search for phrases\n* Use **from:** to find posts from specific users and **in:** to find posts in specific channels\n* Use **on:** to find posts on a specific date\n* Use **before:** to find posts before a specific date\n* Use **after:** to find posts after a specific date",
+ "search_bar.usage.tips": "* Use **\"quotation marks\"** to search for phrases\n* Use **from:** to find posts from specific users and **in:** to find posts in specific channels\n* Use **on:** to find posts on a specific date\n* Use **before:** to find posts before a specific date\n* Use **after:** to find posts after a specific date\n* Use **dash** \"-\" to exclude search terms and modifiers",
  "search_bar.usage.title": "Search Options",
  "search_header.loading": "Searching...",
  "search_header.results": "Search Results",