literals.rdoc: Update for symbol literals

* doc/syntax/literals.rdoc (Symbols): now Symbols created by
  interpolation can be garbage collected.  patch by Yihang Ho in
  [ruby-core:67194].  [Bug #10671]
[ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49056 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Mon Dec 29 14:27:33 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* doc/syntax/literals.rdoc (Symbols): now Symbols created by
+	  interpolation can be garbage collected.  patch by Yihang Ho in
+	  [ruby-core:67194].  [Bug #10671]
+
 Mon Dec 29 11:18:17 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* thread.c (rb_thread_variable_get): fix dynamic symbol keys.

doc/syntax/literals.rdoc

@@ -199,9 +199,6 @@ You may also create symbols by interpolation:
   :"my_symbol1"
   :"my_symbol#{1 + 1}"
 
-Note that symbols are never garbage collected so be careful when referencing
-symbols using interpolation.
-
 Like strings, a single-quote may be used to disable interpolation:
 
   :'my_symbol#{1 + 1}' #=> :"my_symbol\#{1 + 1}"