examples: fix (2022-12)

[maiha]

Happy Christmas to Crystal!
Let's catch up examples before the New Year. 😃

• checker: https://github.com/maiha/crystal-examples (1.3.0)
• compiler: Crystal 1.7.0-dev [63e46eb] (2022-12-23)
• last commit: 63e46eb

This version newly supports the following comment literals.

x # => 10.00:00:00.000010000
x # => UUID(ba714f86-cac6-42c7-8956-bcf5105e1b81)
x # => 2016-02-15 04:35:50.0 UTC
x # => NaN
x # => Foo(@a=1, @b=1.0)

This increased coverage from 75.3% to 85.8%.

75.3%(1489/1979)  1489 success 44 pending 3 general 142 pseudo 70 macro 9 wrong 44 random
↓
85.8%(1725/2010)  1725 success 4 pending 5 general 103 pseudo 72 macro 14 wrong 87 random

Best regards,