fix #16364 (#16379) [backport]

* fix #16364

* add comments

* Update tools/dochack/dochack.nim

Co-authored-by: Clyybber <darkmine956@gmail.com>

Co-authored-by: Clyybber <darkmine956@gmail.com>

tools/dochack/dochack.nim

@@ -268,15 +268,13 @@ var
 template normalize(x: cstring): cstring = x.toLower.replace("_", "")
 
 proc escapeCString(x: var cstring) =
+  # Original strings are already escaped except HTML tags, so
+  # we only escape `<` and `>`.
   var s = ""
   for c in x:
     case c
-    of '&': s.add("&amp;")
     of '<': s.add("&lt;")
     of '>': s.add("&gt;")
-    of '"': s.add("&quot;")
-    of '\'': s.add("&#039;")
-    of '/': s.add("&#x2F;")
     else: s.add(c)
   x = s.cstring