Update specification.md , reordering to make more sense

google#580

docs/specification.md

@@ -35,6 +35,15 @@ The latitude number must be clipped to be in the range -90 to 90.
 
 The longitude number must be normalised to be in the range -180 to 180.
 
+### Code length
+
+The minimum valid length of an Open Location Code is two digits.
+The maximum length of an Open Location Code is 15 digits.
+
+Below 10 digits, only even numbers are valid lengths.
+
+The default length for most purposes is 10 digits.
+
 ### Most significant 10 digits
 
 Summary:
@@ -62,15 +71,6 @@ The following provides an algorithm to encode the values from least significant
 1. Divide longitude by four and latitude by five.
 1. Repeat from step 2 four more times.
 
-### Code length
-
-The minimum valid length of an Open Location Code is two digits.
-The maximum length of an Open Location Code is 15 digits.
-
-Below 10 digits, only even numbers are valid lengths.
-
-The default length for most purposes is 10 digits.
-
 ### Formatting
 
 The format separator must be inserted after eight digits.