[swift/en] Fix typos

swift.html.markdown

@@ -91,7 +91,7 @@ let multiLineString = """
     This is a multi-line string.
     It's called that because it takes up multiple lines (wow!)
         Any indentation beyond the closing quotation marks is kept, the rest is discarded.
-    You can include " or "" in multi-line strings because the delimeter is three "s.
+    You can include " or "" in multi-line strings because the delimiter is three "s.
     """
 
 // Arrays
@@ -370,7 +370,7 @@ func say(_ message: String) {
 }
 say("Hello")
 
-// Default parameters can be ommitted when calling the function.
+// Default parameters can be omitted when calling the function.
 func printParameters(requiredParameter r: Int, optionalParameter o: Int = 10) {
     print("The required parameter was \(r) and the optional parameter was \(o)")
 }