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Differ LazyLock vs. OnceLock in std::sync overview

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Original file line number	Diff line number	Diff line change
`@@ -136,7 +136,10 @@`
`136`	`136`	//! - [`Once`]: Used for a thread-safe, one-time global initialization routine
`137`	`137`	`//!`
`138`	`138`	//! - [`OnceLock`]: Used for thread-safe, one-time initialization of a
`139`		`-//! global variable.`
	`139`	`+//! variable, with potentially different initializers based on the caller.`
	`140`	`+//!`
	`141`	+//! - [`LazyLock`]: Used for thread-safe, one-time initialization of a
	`142`	`+//! variable, using one nullary initializer function provided at creation.`
`140`	`143`	`//!`
`141`	`144`	//! - [`RwLock`]: Provides a mutual exclusion mechanism which allows
`142`	`145`	`//! multiple readers at the same time, while allowing only one`

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