[apl/en] format correctly (#4938)

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-⍝ These examples can be tested here:
-⍝    http://ngn.github.io/apl/web/index.html
-⍝
-⍝ Comments in APL are prefixed by ⍝.
-
-⍝ A list of numbers. (¯ is negative)
-2 3e7 ¯4 50.3
-
-⍝ An expression, showing some functions. In APL, there's
-⍝ no order of operations: everything is parsed right-to-
-⍝ left. This is equal to 5 + (4 × (2 ÷ (5 - 3))) = 9:
-5 + 4 × 2 ÷ 5 - 3        ⍝ 9
-
-⍝ These functions work on lists, too:
-1 2 3 4 × 5              ⍝ 5 10 15 20
-1 2 3 4 × 5 6 7 8        ⍝ 5 12 21 32
-
-⍝ All functions have single-argument and dual-argument
-⍝ meanings. For example, "×" applied to two arguments
-⍝ means multiply, but when applied to only a right-hand 
-⍝ side, it returns the sign:
-
-× ¯4 ¯2 0 2 4            ⍝ ¯1 ¯1 0 1 1
-
-⍝ Values can be compared using these operators (1 means
-⍝ "true", 0 means "false"):
-
-10 20 30 = 10 20 99      ⍝ 1 1 0
-
-10 20 30 < 10 20 99      ⍝ 0 0 1
-
-⍝ "⍳n" returns a vector containing the first n naturals.
-⍝ Matrices can be constructed using ⍴ (reshape):
-4 3 ⍴ ⍳5                 ⍝ 0 1 2
-                         ⍝ 3 4 0
-                         ⍝ 1 2 3
-                         ⍝ 4 0 1
-
-⍝ Single-argument ⍴ gives you the dimensions back:
-⍴ 4 3 ⍴ ⍳5               ⍝ 4 3
-
-⍝ Values can be stored using ←. Let's calculate the mean
-⍝ value of a vector of numbers:
-A ← 10 60 55 23
-
-⍝ Sum of elements of A (/ is reduce):
-+/A                      ⍝ 148
-
-⍝ Length of A:
-⍴A                       ⍝ 4
-
-⍝ Mean:
-(+/A) ÷ (⍴A)             ⍝ 37
-
-⍝ We can define this as a function using {} and ⍵:
-mean ← {(+/⍵)÷⍴⍵}
-mean A                   ⍝ 37