Sync the leap exercise's docs with the latest data.

exercises/practice/leap/.docs/instructions.md

@@ -1,22 +1,3 @@
 # Instructions
 
-Given a year, report if it is a leap year.
-
-The tricky thing here is that a leap year in the Gregorian calendar occurs:
-
-```text
-on every year that is evenly divisible by 4
-  except every year that is evenly divisible by 100
-    unless the year is also evenly divisible by 400
-```
-
-For example, 1997 is not a leap year, but 1996 is.
-1900 is not a leap year, but 2000 is.
-
-## Notes
-
-Though our exercise adopts some very simple rules, there is more to learn!
-
-For a delightful, four minute explanation of the whole leap year phenomenon, go watch [this youtube video][video].
-
-[video]: https://www.youtube.com/watch?v=xX96xng7sAE
+Your task is to determine whether a given year is a leap year.

exercises/practice/leap/.docs/introduction.md

@@ -0,0 +1,16 @@
+# Introduction
+
+A leap year (in the Gregorian calendar) occurs:
+
+- In every year that is evenly divisible by 4.
+- Unless the year is evenly divisible by 100, in which case it's only a leap year if the year is also evenly divisible by 400.
+
+Some examples:
+
+- 1997 was not a leap year as it's not divisible by 4.
+- 1900 was not a leap year as it's not divisible by 400.
+- 2000 was a leap year!
+
+~~~~exercism/note
+For a delightful, four-minute explanation of the whole phenomenon of leap years, check out [this YouTube video](https://www.youtube.com/watch?v=xX96xng7sAE).
+~~~~