Stop documenting json and jsonkey context types.

They should not be needed when buildout handles its own serialisation.

slapos/recipe/template/README.jinja2.txt

@@ -19,8 +19,6 @@ Example buildout demonstrating some types::
     ...     key     bar          section:key
     ...     key     recipe       :recipe
     ...     raw     knight       Ni !
-    ...     json    words        ["Peng", "Neee-wom"]
-    ...     jsonkey later        section:later-words
     ...     import  json_module  json
     ...     section param_dict   parameter-collection
     ...
@@ -30,15 +28,13 @@ Example buildout demonstrating some types::
     ...
     ... [section]
     ... key = value
-    ... later-words = "Ekke Ekke Ekke Ekke Ptangya Ziiinnggggggg Ni!"
     ... ''')
 
 And according Jinja2 template (kept simple, control structures are possible)::
 
     >>> write('foo.in',
     ...     '{{bar}}\n'
-    ...     'Knights who say "{{knight}}" also protect {{ words | join(", ") }}.\n'
-    ...     'They later say {{later}}\n'
+    ...     'Knights who say "{{knight}}"\n'
     ...     '${this:is_literal}\n'
     ...     '${foo:{{bar}}}\n'
     ...     'swallow: {{ json_module.dumps(("african", "european")) }}\n'
@@ -55,8 +51,7 @@ And the template has been rendered::
 
     >>> cat('foo')
     value
-    Knights who say "Ni !" also protect Peng, Neee-wom.
-    They later say Ekke Ekke Ekke Ekke Ptangya Ziiinnggggggg Ni!
+    Knights who say "Ni !"
     ${this:is_literal}
     ${foo:value}
     swallow: ["african", "european"]
@@ -87,15 +82,9 @@ Optional:
   ``raw``
     Immediate literal string.
 
-  ``json``
-    Immediate json-encoded string. (deprecated)
-
   ``key``
     Indirect literal string.
 
-  ``jsonkey``
-    Indirect json-encoded string. (deprecated)
-
   ``import``
     Import a python module.
 
@@ -104,9 +93,9 @@ Optional:
 
   Indirection targets are specified as: [section]:key .
   It is possible to use buildout's buit-in variable replacement instead instead
-  of ``key`` or ``jsonkey`` types, but keep in mind that different lines are
-  different variables for this recipe. It might be what you want (factorising
-  context chunk declarations), otherwise you should use indirect types.
+  of ``key`` type, but keep in mind that different lines are different
+  variables for this recipe. It might be what you want (factorising context
+  chunk declarations), otherwise you should use indirect types.
 
 ``md5sum``
   Template's MD5, for file integrity checking. By default, no integrity check