Merge branch 'doc/update_disclaimer' into 'master'

update disclaimer for this repo

See merge request sdk/ESP8266_RTOS_SDK!1584

Author: donghengqaz

docs/en/conf.py

@@ -12,7 +12,7 @@
 
 # General information about the project.
 project = u'ESP8266 RTOS SDK Programming Guide'
-copyright = u'2016 - 2019, Espressif Systems (Shanghai) PTE LTD'
+copyright = u'2020, Espressif Systems (Shanghai) Co., Ltd.'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.