Fix minor code style issues
diff --git a/include/mbedtls/gcm.h b/include/mbedtls/gcm.h
index 3c22033..bec5577 100644
--- a/include/mbedtls/gcm.h
+++ b/include/mbedtls/gcm.h
@@ -116,7 +116,7 @@
* \param ctx The GCM context to use for encryption or decryption.
* \param mode The operation to perform: #MBEDTLS_GCM_ENCRYPT or
* #MBEDTLS_GCM_DECRYPT.
- * \param length The length of the input data. This must be a multiple of
+ * \param length The length of the input data. This must be a multiple of
* 16 except in the last call before mbedtls_gcm_finish().
* \param iv The initialization vector.
* \param iv_len The length of the IV.