slog: update value receiver names

[suntala]

This change unifies the naming of the receivers in the value.go
file (https://github.com/golang/exp/blob/master/slog/value.go).

It also fixes the discrepancy between the doc comment
("v's value") and the receiver's name for this function:

exp/slog/value.go

Lines 281 to 283 in d63ba01

	// Duration returns v's value as a time.Duration. It panics
	// if v is not a time.Duration.
	func (a Value) Duration() time.Duration {

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Patch Set 2: Code-Review+1

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Patch Set 3: Run-TryBot+1

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Patch Set 3: Code-Review+2

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This PR is being closed because golang.org/cl/516755 has been merged.