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Document the use of next to throw an exception when hitting EOF

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Original file line number	Diff line number	Diff line change
`@@ -716,7 +716,7 @@ def blame_incremental(self, rev, file, **kwargs):`
`716`	`716`	`# Discard all lines until we find "filename" which is`
`717`	`717`	`# guaranteed to be the last line`
`718`	`718`	`whileTrue:`
`719`		`-line=next(stream)`
	`719`	`+line=next(stream)# will fail if we reach the EOF unexpectedly`
`720`	`720`	`tag,value=line.split(b' ',1)`
`721`	`721`	`iftag==b'filename':`
`722`	`722`	`orig_filename=value`

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