Fixed typo in _buttons.less

Author: kalpmehta

lib/web/css/docs/source/_buttons.less

@@ -397,7 +397,7 @@ button {
 
 //  # Button with an icon on the left or right side of the text
 //
-//  <code>@_button-icon-font-position</code> variable is used to set up the icon postiton
+//  <code>@_button-icon-font-position</code> variable is used to set up the icon position
 //
 //  Use <code>before</code> to set up button icon position on the left:
 //  ```css
@@ -818,7 +818,7 @@ button {
 
 //  # Link as a button
 //
-//  The <code>.lib-link-as-button()</code> mixin is used to reset link styles (text-decoration and display inline). Then to make it look like a button, you need to add the <code>.lib-button()</code> mixin with appropriate paremeters.
+//  The <code>.lib-link-as-button()</code> mixin is used to reset link styles (text-decoration and display inline). Then to make it look like a button, you need to add the <code>.lib-button()</code> mixin with appropriate parameters.
 //
 //  ```html
 //  <a href="#" class="example-button-9"><span>Button</span></a>