Update gates.md

docs/gates.md

@@ -1,14 +1,17 @@
-#### Search and return only certain fields
+**Search and return only certain fields**
 
-Search by regular expression (use the slash or quote marks as a delimiter).
-@{"name": {$regex: /^M.*/}}
+**Search by regular expression (use the slash or quote marks as a delimiter).
+**@{$name: {$regex: /^M.*/}}
 
-Case insensitive:
-@{"name": {$regex: /^jan.*/, $options: "i"}}
+**Case insensitive:
+**@{$name: {$regex: /^jan.*/, $options: "i"}}
 
-Find by elements in array
-This matches documents that contain all of these array elements:
-@{"skills": {$all: }}
+**Find by elements in array
+**This matches documents that contain all of these array elements:
+@{$skills: {$all: }}
 
-Match on any element in the array:
-@{"skills": "negotiation"}
+**Match on any element in the array:
+**@{$skills: "negotiation"}
+
+**Match on inequality
+@{ $strength: { $gt: 18 } }