gmoccapy: update release notes

Author: hansu

src/emc/usr_intf/gmoccapy/release_notes.txt

@@ -1,3 +1,7 @@
+- fixed sensitizing of user tab button on toggling "edit offsets" (#2111)
+- fix error on creating new G-code file when RS274NGC_STARTUP_CODE is not set
+  (#2057)
+
 ver 3.1.3.8 (LinuxCNC 2.8.4 release)
 - jogging with max speed (with shift-key pressed) was reduced by halui setting