Add changelog entry regarding the pre-verify callback

Fix minor typos
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index c87b370..b2bb964 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -5888,8 +5888,8 @@
                          mbedtls_ssl_pre_verify_t *f_pre_vrfy,
                          void *p_pre_vrfy)
 {
-  conf->f_pre_vrfy = f_pre_vrfy;
-  conf->p_pre_vrfy = p_pre_vrfy;
+    conf->f_pre_vrfy = f_pre_vrfy;
+    conf->p_pre_vrfy = p_pre_vrfy;
 }
 #endif /* MBEDTLS_X509_CRT_PARSE_C */