Update Zoekt syntax documentation

doc/user/search/exact_code_search.md

@@ -28,5 +28,19 @@ searches.
 
 ## Syntax
 
-To understand the possible filtering options, see the
-[Zoekt query syntax](https://github.com/sourcegraph/zoekt/blob/main/doc/query_syntax.md).
+This table shows some example queries for exact code search.
+
+| Query                | Description                                                                           |
+| -------------------- |-------------------------------------------------------------------------------------- |
+| `foo`                | Returns files that contain `foo`                                                      |
+| `"class foo"`        | Returns files that contain the exact string `class foo`                               |
+| `class foo`          | Returns files that contain both `class` and `foo`                                     |
+| `foo or bar`         | Returns files that contain either `foo` or `bar`                                      |
+| `class Foo`          | Returns files that contain `class` (case insensitive) and `Foo` (case sensitive)      |
+| `class Foo case:yes` | Returns files that contain `class` and `Foo` (both case sensitive)                    |
+| `foo -bar`           | Returns files that contain `foo` but not `bar`                                        |
+| `foo file:js`        | Searches for `foo` in files with names that contain `js`                              |
+| `foo -file:test`     | Searches for `foo` in files with names that do not contain `test`                     |
+| `foo lang:ruby`      | Searches for `foo` in Ruby source code                                                |
+| `foo f:\.js$`        | Searches for `foo` in files with names that end with `.js`                            |
+| `foo.*bar`           | Searches for strings that match the regular expression `foo.*bar`                     |