chore: Fix a typo (period at a wrong place) (#1091)

* chore: Fix a typo (period at a wrong place)

```
Adding SQL inline comments will be.

'/**/UNION/**/SELECT/**/password/**/FROM/**/Users/**/WHERE/**/name/**/LIKE/**/'admin'--
```

--- The sentence ends with a period, (.) even though there's an example query right after it. This commit removes the period, and places a colon.


---------

Co-authored-by: Rick M <kingthorin@users.noreply.github.com>

document/4-Web_Application_Security_Testing/07-Input_Validation_Testing/05-Testing_for_SQL_Injection.md

@@ -698,7 +698,7 @@ Adding SQL inline comments can also help the SQL statement to be valid and bypas
 
 `' UNION SELECT password FROM Users WHERE name='admin'--`
 
-Adding SQL inline comments will be.
+Adding SQL inline comments will be:
 
 `'/**/UNION/**/SELECT/**/password/**/FROM/**/Users/**/WHERE/**/name/**/LIKE/**/'admin'--`