[Bug-wget] Add `--retry-on-http-error` to help message

[Giovanni Tirloni]

I noticed this option is not documented in the help. Here's a patch for it.

diff --git a/src/main.c b/src/main.c
index 5430e7ce..46824efd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -636,6 +636,8 @@ Download:\n"),
   -t,  --tries=NUMBER              set number of retries to NUMBER (0 
unlimits)\n"),
     N_("\
        --retry-connrefused         retry even if connection is refused\n"),
+    N_("\
+       --retry-on-http-error=ERRORS    comma-separated list of HTTP errors to 
retry\n"),
     N_("\
   -O,  --output-document=FILE      write documents to FILE\n"),
     N_("\