Added not on 3-char limitation

doc/help/Search.md

@@ -8,4 +8,8 @@ Some things to know about search:
 - You can use quotes to return search results for exact terms, like `"Mattermost website"` will only return messages containing the entire phrase `"Mattermost website"` and not return messages with only `Mattermost` or `website`
 - You can use the `*` character for wildcard searches that match within words. For example: Searching for `rea*` brings back messages containing `reach`, `reason` and other words starting with `rea`.
 
-Search in Mattermost uses the full text search features in MySQL and Postgres databases. Special cases that are not supported in default full text search, such as searching for IP addresses like `10.100.200.101`, can be added in future as the search feature evolves. 
+#### Limitations
+
+- Search in Mattermost uses the full text search features included in either a MySQL or Postgres database, which has some limitations
+  - Special cases that are not supported in default full text search, such as searching for IP addresses like `10.100.200.101`, can be added in future as the search feature evolves
+  - Searches with fewer than three characters will return no results, so for searching in Chinese try adding * to the end of queries