Remove tabs after spaces in C comments

This was not changed in HEAD, but will be done later as part of a
pgindent run.  Future pgindent runs will also do this.

Report by Tom Lane

Backpatch through all supported branches, but not HEAD

src/backend/storage/freespace/fsmpage.c

@@ -185,13 +185,13 @@ restart:
 
 	/*----------
 	 * Start the search from the target slot.  At every step, move one
-	 * node to the right, then climb up to the parent.	Stop when we reach
+	 * node to the right, then climb up to the parent.  Stop when we reach
 	 * a node with enough free space (as we must, since the root has enough
 	 * space).
 	 *
 	 * The idea is to gradually expand our "search triangle", that is, all
 	 * nodes covered by the current node, and to be sure we search to the
-	 * right from the start point.	At the first step, only the target slot
+	 * right from the start point.  At the first step, only the target slot
 	 * is examined.  When we move up from a left child to its parent, we are
 	 * adding the right-hand subtree of that parent to the search triangle.
 	 * When we move right then up from a right child, we are dropping the