Update position.md (#25607)

2 small typos

docs/4.0/utilities/position.md

@@ -20,7 +20,7 @@ Quick positioning classes are available, though they are not responsive.
 
 ## Fixed top
 
-Position an element at the top of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add aditional CSS.
+Position an element at the top of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add additional CSS.
 
 {% highlight html %}
 <div class="fixed-top">...</div>
@@ -28,7 +28,7 @@ Position an element at the top of the viewport, from edge to edge. Be sure you u
 
 ## Fixed bottom
 
-Position an element at the bottom of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add aditional CSS.
+Position an element at the bottom of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add additional CSS.
 
 {% highlight html %}
 <div class="fixed-bottom">...</div>