correct example in the book

FossilOrigin-Name: 8d604e598900fdb34a8e529972c21c865f7fce9e33dcbfafc9e8eb966d1955e4
2019-08-25 14:32:52 +00:00 · 2019-08-25 14:32:52 +00:00 · 942ec249f0
commit 942ec249f0
parent cd9f9de76c
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+++ b/3
@ -13,6 +13,8 @@

 ## Documentation

+- correct example for retro-compiler
+
 ## Toolchain

 - added retro-tags
@ -22,6 +24,7 @@
 - new examples
  - retro-tags.retro
  - Gott.retro
+  - namespaces.retro
 - use .retro extension

 ## General
--- a/RETRO-Book.md
+++ b/RETRO-Book.md
@ -2475,7 +2475,9 @@ Example:
 Given a `hello.forth`:

 ```
+~~~
 :hello 'Hello_World! s:put nl ;
+~~~
 ```

 Use:
--- a/doc/book/Retro-Compiler
+++ b/doc/book/Retro-Compiler
@ -35,7 +35,9 @@ Example:
 Given a `hello.forth`:

 ```
+~~~
 :hello 'Hello_World! s:put nl ;
+~~~
 ```

 Use: