Minor fixes

1. Rephrase ChangeLog entry.
2. Add a full stop at the end of the fuinction documentation.
diff --git a/ChangeLog b/ChangeLog
index 10f0773..c0c4cd2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -18,9 +18,9 @@
      return value. Found by @davidwu2000. #839
    * Fix a memory leak in mbedtls_x509_csr_parse(), found by catenacyber,
      Philippe Antoine. Fixes #1623.
-   * Remove wrong documentation for `mbedtls_ssl_get_session`.
+   * Correct the documentation for `mbedtls_ssl_get_session()`.
      This API has deep copy of the session, and the peer
-     certificate is not lost. #926
+     certificate is not lost. Fixes #926.
 
 Changes
    * Change the shebang line in Perl scripts to look up perl in the PATH.