Fixed mproper icon format.

src/docs/asciidoc/blender/blender_buffer_clearing.adoc

@@ -27,7 +27,7 @@ The exception to this rule is the `Linked Action` buffer, for animations, locate
 . Click the `Action to be linked` button and select the action you want cleared.
 . Deselect the btn:[F] button to prevent it from saving.
 . Change the editor type from `Dope Sheet` to `NLA Editor`. You will see the action listed.
-. Click the icon:angle-double-down []  button next to the action to push it into the stack.
+. Click the icon:angle-double-down[]  button next to the action to push it into the stack.
 . Click the small start next to the track name.
 . With the mouse inside the `NLA Track List`,  press kbd:[X] to delete both the track and strip.
 . Save your file.