RFR: 8296335 : Fix accessibility manual test instruction

[Alexey Ivanov]

On Fri, 4 Nov 2022 20:18:09 GMT, lawrence.andrews <duke at openjdk.org> wrote:

> Fixed test instruction that helps the manual tester to perform actions
> 
> @shurymury

test/jdk/javax/accessibility/manual/TableDemo.html line 81:

> 79: </html>
> 80: 
> 81:                                         

Let us preserve the last blank line in the files. Or add if it's not there.

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PR: https://git.openjdk.org/jdk/pull/10996