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Fix some grammar and typos in comments and docs
The documentation fixes are backpatched down to where they apply. Author: Justin Pryzby Discussion: https://postgr.es/m/20201031020801.GD3080@telsasoft.com Backpatch-through: 9.6
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@ -560,7 +560,7 @@ PrefetchSharedBuffer(SMgrRelation smgr_reln,
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* could be used by the caller to avoid the need for a later buffer lookup, but
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* it's not pinned, so the caller must recheck it.
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*
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* 2. If the kernel has been asked to initiate I/O, the initated_io member is
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* 2. If the kernel has been asked to initiate I/O, the initiated_io member is
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* true. Currently there is no way to know if the data was already cached by
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* the kernel and therefore didn't really initiate I/O, and no way to know when
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* the I/O completes other than using synchronous ReadBuffer().
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