fix typo error

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 6afccbd..b6c1ff3 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -6494,7 +6494,7 @@
 #endif /* !MBEDTLS_DEPRECATED_REMOVED */
 
 /* NOTICE:
- *   For ssl_preset_*_sig_algs and ssl_tls12_preset_*_sig_algs, the folloing
+ *   For ssl_preset_*_sig_algs and ssl_tls12_preset_*_sig_algs, the following
  *   rules SHOULD be upheld.
  *   - No duplicate entries.
  *   - But if there is a good reason, do not change the order of the algorithms.