Update lld/MachO/Options.td

Co-authored-by: Daniel Rodríguez Troitiño <[email protected]>

Author: johnno1962

lld/MachO/Options.td

@@ -397,7 +397,7 @@ def interposable : Flag<["-"], "interposable">,
     HelpText<"Indirects access to all exported symbols in an image">,
     Group<grp_opts>;
 def read_threads : Joined<["--"], "read-threads=">,
-    HelpText<"Number of threads to use to proactively page in files for faster disk i/o. 20 would be a typical value, use 0 to disable this feature.">,
+    HelpText<"Number of threads to eagerly preload input files content into memory. Use 0 to disable this feature. Default is disabled.">,
     Group<grp_lld>;
 def order_file : Separate<["-"], "order_file">,
     MetaVarName<"<file>">,