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C comment: correct use of 64-"byte" cache line size

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Original file line number	Diff line number	Diff line change
`@@ -204,7 +204,7 @@ typedef struct BufferDesc`
`204`	`204`	`* Note that local buffer descriptors aren't forced to be aligned - as there's`
`205`	`205`	`* no concurrent access to those it's unlikely to be beneficial.`
`206`	`206`	`*`
`207`		`- * We use64bit as the cache line size here, because that's the most common`
	`207`	`+ * We usea 64-byte cache line size here, because that's the most common`
`208`	`208`	`* size. Making it bigger would be a waste of memory. Even if running on a`
`209`	`209`	`* platform with either 32 or 128 byte line sizes, it's good to align to`
`210`	`210`	`* boundaries and avoid false sharing.`

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