rts: Fix references to Note [BFD import library]

Reviewers: austin, erikd, simonmar

Subscribers: rwbarton, thomie

Differential Revision: https://phabricator.haskell.org/D3884

rts/LinkerInternals.h

@@ -32,7 +32,7 @@ typedef enum {
 /* Indication of section kinds for loaded objects.  Needed by
    the GC for deciding whether or not a pointer on the stack
    is a code pointer.
-   See Note [BFD import libraries].
+   See Note [BFD import library].
 */
 typedef
    enum { /* Section is code or readonly. e.g. .text or .r(o)data.  */

rts/RtsSymbolInfo.h

@@ -11,7 +11,7 @@
 #include "LinkerInternals.h"
 #include <stdbool.h>
 
-/* See Note [BFD Import libraries].  */
+/* See Note [BFD Import library].  */
 typedef enum _SymbolKind {
     KIND_NORMAL = 0x01,
     KIND_WEAK   = 0x02,

rts/linker/PEi386.c

@@ -58,6 +58,7 @@
      tools. See note below.
 
    Note [BFD import library]
+   ~~~~~~~~~~~~~~~~~~~~~~~~~
 
    On Windows, compilers don't link directly to dynamic libraries.
    The reason for this is that the exports are not always by symbol, the