Update test file location in manpage

[postscript-dev]

Briefly discussed here.

[codecov]

Codecov Report

Merging #2043 (cf8f791) into main (b52b6db) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2043   +/-   ##
=======================================
  Coverage   61.38%   61.38%           
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  Files          96       96           
  Lines       19214    19214           
  Branches     9852     9852           
=======================================
  Hits        11794    11794           
  Misses       5096     5096           
  Partials     2324     2324           

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[clanmills]

Happy New Year. Best Wishes for 2022. This change looks good.

The file is there and will remain there. It's checked into website/master and copied into website/html build the website build scripts. I'll probably ask @nehaljwani to move file into the new testdata repos. However, that's a detail about how the website is built and will not impact exiv2.md