Clarify how wildcards work for purge custom directory

[johnsimons]

In:

the help text:

A newline-separated list of file or directory names, relative to the installation directory, to leave 
when it is purged. Extended wildcard syntax is supported. 
E.g., appsettings.config, Config\*.config, **\*.config

could be more clear on when to use wildcards

Raised by customer in https://help.octopusdeploy.com/discussions/questions/12996-exclude-from-purge-iis-templateperformance-hit

[larssb]

I'm the customer that raised the issue. It would be wonderful with some kind of warning/explanation that wildcards should only be used to match on files not folders (to include all files in a folder).

Thank you.

[droyad]

@johnsimons @larssb How does this sound? (Bold added to show the added text)

A newline-separated list of file or directory names, relative to the installation directory, to leave
when it is purged. To exclude a whole directory, specify it by name without a wildcard. Extended wildcard syntax is supported. E.g., appsettings.config, Config\.config, Config, **\.config

[droyad]

[droyad]

Release Note: Clarified how to exclude directories when purging a custom installation directory

[larssb]

Sounds good to me :-)

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