NIFI-1826 Updated documentation

Signed-off-by: Matt Burgess <mattyb...@apache.org>

This closes #396


Project: http://git-wip-us.apache.org/repos/asf/nifi/repo
Commit: http://git-wip-us.apache.org/repos/asf/nifi/commit/b7aa381a
Tree: http://git-wip-us.apache.org/repos/asf/nifi/tree/b7aa381a
Diff: http://git-wip-us.apache.org/repos/asf/nifi/diff/b7aa381a

Branch: refs/heads/master
Commit: b7aa381ab478746839ef0f4855c424edf584a4d8
Parents: 7910e98
Author: Pierre Villard <pierre.villard...@gmail.com>
Authored: Sat Apr 30 12:38:55 2016 +0200
Committer: Matt Burgess <mattyb...@apache.org>
Committed: Wed May 11 10:02:11 2016 -0400

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 .../asciidoc/expression-language-guide.adoc     | 22 ++++++++++++++++++++
 1 file changed, 22 insertions(+)
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http://git-wip-us.apache.org/repos/asf/nifi/blob/b7aa381a/nifi-docs/src/main/asciidoc/expression-language-guide.adoc
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diff --git a/nifi-docs/src/main/asciidoc/expression-language-guide.adoc 
b/nifi-docs/src/main/asciidoc/expression-language-guide.adoc
index 6f72510..1580037 100644
--- a/nifi-docs/src/main/asciidoc/expression-language-guide.adoc
+++ b/nifi-docs/src/main/asciidoc/expression-language-guide.adoc
@@ -1036,6 +1036,28 @@ Each of the following functions is used to search its 
subject for some value.
 
 
 [.function]
+=== in
+
+*Description*: [.description]#Returns `true` if the Subject is matching one of 
the provided arguments.#
+
+*Subject Type*: [.subject]#String#
+
+*Arguments*:
+
+       - [.argName]#_value1_# : [.argDesc]#First possible matching value#
+       - [.argName]#_valueN_# : [.argDesc]#Nth possible matching value#
+
+*Return Type*: [.returnType]#Boolean#
+
+*Examples*: If the "myEnum" attribute has the value "JOHN", then the Expression
+       `${myEnum:in("PAUL", "JOHN", "MIKE")}` will return `true`. 
`${myEnum:in("RED", "GREEN", "BLUE")}` will
+       return `false`.
+
+
+
+
+
+[.function]
 === find
 
 *Description*: [.description]#Returns `true` if the Subject contains any 
sequence of characters that matches the

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