Quote the \ in doc comments.

lib/pure/memfiles.nim

@@ -263,8 +263,8 @@ proc toString*(ms: MemSlice): string {.inline.} =
 
 iterator memSlices*(mfile: MemFile, delim='\l', eat='\r'): MemSlice {.inline.} =
   ## Iterates over [optional eat]delim-delimited slices in a MemFile.
-  ## Default delimiting is [\r]\l which parse Unix or Windows text file lines.
-  ## Pass eat='\0' to be strictly delim-delimited.
+  ## Default delimiting is [\\r]\\l which parse Unix or Windows text file lines.
+  ## Pass eat='\\0' to be strictly delim-delimited.
   ## This zero copy, memchr-limited method is probably the fastest way to
   ## iterate through lines in a file, however the returned (data,size) objects
   ## are NOT Nim strings or even terminated C strings.  So, be careful how data
@@ -291,8 +291,8 @@ iterator memSlices*(mfile: MemFile, delim='\l', eat='\r'): MemSlice {.inline.} =
 
 iterator lines*(mfile: MemFile, buf: var TaintedString, delim='\l', eat='\r'): TaintedString {.inline.} =
   ## Replace contents of passed buffer with each new line, like readLine(File).
-  ## Default delimiting is [\r]\l which parse Unix or Windows text file lines.
-  ## Pass eat='\0' to be strictly delim-delimited.
+  ## Default delimiting is [\\r]\\l which parse Unix or Windows text file lines.
+  ## Pass eat='\\0' to be strictly delim-delimited.
   for ms in memSlices(mfile, delim, eat):
     buf.setLen(ms.size)
     c_memcpy(addr(buf[0]), ms.data, ms.size)
@@ -301,7 +301,7 @@ iterator lines*(mfile: MemFile, buf: var TaintedString, delim='\l', eat='\r'): T
 
 iterator lines*(mfile: MemFile, delim='\l', eat='\r'): TaintedString {.inline.} =
   ## Return each line in a file as a Nim string, like lines(File).
-  ## Default delimiting is [\r]\l which parse Unix or Windows text file lines.
+  ## Default delimiting is [\\r]\\l which parse Unix or Windows text file lines.
   ## Pass eat='\0' to be strictly delim-delimited.
   var buf = TaintedString(newStringOfCap(80))
   for line in lines(mfile, buf, delim, eat):