train: escape the literal percent signs in two --help strings (argparse interpolates help text, so '+52 %' crashed --help with 'must be real number, not dict' -- caught by the CPU rehearsal's stage 3)

train/train_ounce100m.py

@@ -259,7 +259,7 @@ def main():
     # that launching the run does not depend on remembering a flag string.
     ap.add_argument("--seq-len", type=int, default=1024)
     ap.add_argument("--attn", default="eager", choices=["eager", "sdpa", "flash_attention_2"],
-                    help="p0c measured eager beating SDPA on Turing; Gate 3 P2/A-B measured +52 % for "
+                    help="p0c measured eager beating SDPA on Turing; Gate 3 P2/A-B measured +52 %% for "
                          "eager at seq 1024 and an OOM at 2048. flash_attention_2 needs sm80+")
     ap.add_argument("--grad-ckpt", default=True, action=argparse.BooleanOptionalAction,
                     help="on by default: it is what keeps peak memory at ~7 GB instead of 12 GB, and the "
@@ -288,7 +288,7 @@ def main():
     ap.add_argument("--resume", default="", help="checkpoint dir; empty = auto from Hub latest")
     ap.add_argument("--val-tokens", type=int, default=2_000_000)
     ap.add_argument("--log-every", type=int, default=10)
-    ap.add_argument("--push-every-steps", type=int, default=0, help="0 = only at 10% boundaries")
+    ap.add_argument("--push-every-steps", type=int, default=0, help="0 = only at 10%% boundaries")
     ap.add_argument("--stop-after-steps", type=int, default=0,
                     help="absolute global step at which THIS session stops training, so it ends on a "
                          "verified checkpoint instead of being killed between two of them. Must be a "