Merge pull request #947 from getong/update_erlang_doc

update to erlang 20

Author: tianon

erlang/content.md

@@ -12,9 +12,9 @@ Erlang is a programming language used to build massively scalable soft real-time
 
 ```console
 ➸ docker run -it --rm erlang
-Erlang/OTP 18 [erts-7.1] [source] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false]
+Erlang/OTP 20 [erts-9.0] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:10] [hipe] [kernel-poll:false]
 
-Eshell V7.1  (abort with ^G)
+Eshell V9.0  (abort with ^G)
 1> uptime().
 3 seconds
 ok
@@ -31,11 +31,11 @@ User switch command
   ? | h             - this message
  --> q
 ➸ docker run -it --rm -h erlang.local erlang erl -name [email protected]
-Erlang/OTP 18 [erts-7.1] [source] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false]
+Erlang/OTP 20 [erts-9.0] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:10] [hipe] [kernel-poll:false]
 
-Eshell V7.1  (abort with ^G)
+Eshell V9.0  (abort with ^G)
 ([email protected])1> erlang:system_info(otp_release).
-"18"
+"20"
 ([email protected])2>
 User switch command
 --> q