remove quotation marks around imports - fixes links in the docs (#16888)

lib/pure/asyncfutures.nim

@@ -9,7 +9,7 @@
 
 import os, tables, strutils, times, heapqueue, options, deques, cstrutils
 
-import "system/stacktraces"
+import system/stacktraces
 
 # TODO: This shouldn't need to be included, but should ideally be exported.
 type

lib/pure/pathnorm.nim

@@ -14,7 +14,7 @@
 
 # Yes, this uses import here, not include so that
 # we don't end up exporting these symbols from pathnorm and os:
-import "includes/osseps"
+import includes/osseps
 
 type
   PathIter* = object

lib/system.nim

@@ -1738,8 +1738,8 @@ proc compiles*(x: untyped): bool {.magic: "Compiles", noSideEffect, compileTime.
   discard
 
 when notJSnotNims:
-  import "system/ansi_c"
-  import "system/memory"
+  import system/ansi_c
+  import system/memory
 
 
 {.push stackTrace: off.}