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 f5c1789..74a9d1b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,9 +3,20 @@
 = mbed TLS x.x.x branch released xxxx-xx-xx
 
 Bugfix
-   * Remove wrong documentation for `mbedtls_ssl_get_session`.
+
+   * Fix the key_app_writer example which was writing a leading zero byte which
+     was creating an invalid ASN.1 tag. Found by Aryeh R. Fixes #1257.
+   * Fix compilation error on C++, because of a variable named new.
+     Found and fixed by Hirotaka Niisato in #1783.
+   * Fix "no symbols" warning issued by ranlib when building on Mac OS X. Fix
+     contributed by tabascoeye in pull request #1600.
+   * Clarify documentation for mbedtls_ssl_write() to include 0 as a valid
+     return value. Found by @davidwu2000. #839
+   * Fix a memory leak in mbedtls_x509_csr_parse(), found by catenacyber,
+     Philippe Antoine. Fixes #1623.
+   * 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.
 
 = mbed TLS 2.1.13 branch released 2018-06-18
 
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 8e234ef..2259717 100755
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -2088,12 +2088,12 @@
  * \return         0 if successful,
  *                 MBEDTLS_ERR_SSL_ALLOC_FAILED if memory allocation failed,
  *                 MBEDTLS_ERR_SSL_BAD_INPUT_DATA if used server-side or
- *                 arguments are otherwise invalid
+ *                 arguments are otherwise invalid.
  *
  * \note           Only the server certificate is copied, and not the chain
  *                 but this is not a problem because the result of the chain
  *                 verification is stored in `verify_result` and can be checked
- *                 with \c mbedtls_ssl_get_verify_result()
+ *                 with \c mbedtls_ssl_get_verify_result().
  *
  * \sa             mbedtls_ssl_set_session()
  */