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

Spelling fixes in comment blocks and docs
diff --git a/system/libraries/Ftp.php b/system/libraries/Ftp.php
index ac960a4..86e5b8f 100644
--- a/system/libraries/Ftp.php
+++ b/system/libraries/Ftp.php
@@ -486,7 +486,7 @@
 		{
 			for ($i = 0, $c = count($list); $i < $c; $i++)
 			{
-				// If we can't delete the item it's probaly a directory,
+				// If we can't delete the item it's probably a directory,
 				// so we'll recursively call delete_dir()
 				if ( ! preg_match('#/\.\.?$#', $list[$i]) && ! @ftp_delete($this->conn_id, $list[$i]))
 				{