[ci skip] Merge pull request #4986 from ka7/feature/spelling

Spelling fixes in comment blocks and docs
diff --git a/system/core/Security.php b/system/core/Security.php
index 585ed90..bacbb78 100644
--- a/system/core/Security.php
+++ b/system/core/Security.php
@@ -869,7 +869,7 @@
 			// Each iteration filters a single attribute
 			do
 			{
-				// Strip any non-alpha characters that may preceed an attribute.
+				// Strip any non-alpha characters that may precede an attribute.
 				// Browsers often parse these incorrectly and that has been a
 				// of numerous XSS issues we've had.
 				$matches['attributes'] = preg_replace('#^[^a-z]+#i', '', $matches['attributes']);