Update upgrade/rendering-changes/6-3-0.md

Co-authored-by: Iva Stefanova Koevska-Atanasova <[email protected]>

Author: ntacheva

upgrade/rendering-changes/6-3-0.md

@@ -47,7 +47,7 @@ The `Open`, `Download` and `Print` tools have been moved to a submenu toggled on
 
 ## TabStrip
 
-1. The active (currently selected) tabs now render only the `k-active` class. The` k-tab-on-top` class is no longer applied.
+1. The active (currently selected) tabs now render only the `k-active` class. The `k-tab-on-top` class is no longer applied.
 2. The inactive tabs no longer include the `k-state-default` class.
 3. The scroll buttons (prev & next) now render the `k-tabstrip-prev` and `k-tabstrip-next` classes, respectively.
 4. The `k-pos-relative` class is no longer applied to the `<div class="k-tabstrip">` element. The component now receives an inline `position: relative` style instead.