Moved uri_encode documentation to "field-level" section. (#314)

Author: blackwinter

README.md

@@ -242,14 +242,6 @@ put_vars(
 )
 ```
 
-##### `uri_encode`
-
-Encodes a field value as URI. Aka percent-encoding.
-
-```perl
-uri_encode("<sourceField>")
-```
-
 #### Record-level functions
 
 ##### `add_field`
@@ -724,6 +716,14 @@ Upcases all characters in a field value.
 upcase("<sourceField>")
 ```
 
+##### `uri_encode`
+
+Encodes a field value as URI. Aka percent-encoding.
+
+```perl
+uri_encode("<sourceField>")
+```
+
 ### Selectors
 
 #### `reject`