Add space

Author: yui-knk

getting_started/meta/1.markdown

@@ -77,7 +77,7 @@ Besides the tuple defined above, there are five Elixir literals that, when quote
 ```elixir
 :sum         #=> Atoms
 1.0          #=> Numbers
-[1,2]        #=> Lists
+[1, 2]       #=> Lists
 "strings"    #=> Strings
 {key, value} #=> Tuples with two elements
 ```