Correct key name for the label function in the label documentation

The code in ProjectConfig expects that the key for the label function
is called 'function' but in the documentation it was described as
'functionName'.

Change-Id: I9529d6233df5d6c6859d4cda71fdd503b19b940a
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/config-labels.txt b/Documentation/config-labels.txt
index 9aea995..4f84bf6 100644
--- a/Documentation/config-labels.txt
+++ b/Documentation/config-labels.txt
@@ -95,7 +95,7 @@
 
 ====
   [label "Verified"]
-      functionName = MaxWithBlock
+      function = MaxWithBlock
       value = -1 Fails
       value =  0 No score
       value = +1 Verified
@@ -184,9 +184,9 @@
 in the label name, e.g. `Label-Name` is abbreviated by default as `LN`.
 
 
-[[label_functionName]]
-`label.Label-Name.functionName`
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+[[label_function]]
+`label.Label-Name.function`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The name of a function for evaluating multiple votes for a label.  This
 function is only applied if the default submit rule is used for a label.
@@ -240,7 +240,7 @@
 
 ====
   [label "Copyright-Check"]
-      functionName = MaxWithBlock
+      function = MaxWithBlock
       value = -1 Do not have copyright
       value =  0 No score
       value = +1 Copyright clear