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Update if-let.md

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src/doc/book/if-let.md
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% if let
`if let` allows us to match [patterns][patterns] within the condition of an [if][if].
As a consequence, we reduce the overhead of certain kinds of [pattern][patterns] matches
`if let` permits [patterns][pattern] matching within the condition of an [if][if] statement.
This allows us to reduce the overhead of certain kinds of [pattern][patterns] matches
and express them in a more convenient way.
For example, let’s say we have some sort of `Option<T>`. We want to call a function