Fixup PETSC_AUTHOR_INFO
The following discussion from !4592 (merged) should be addressed:
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@jedbrown started a discussion: The spacing and line breaks are weird. I think there should be no line breaks or it should all be on one line
PETSc Team <petsc-maint@mcs.anl.gov>
with probably a different variable for the website. (It's out of scope for this MR, but I'm just noticing it now.) Also, I think this should be a variable or API rather than a macro so that Cray (for example) can readily point people to their support without requiring that everyone recompile. (I know this is hypothetical at present because our ABI changes so much depending on configure arguments.)
(@jedbrown I've assigned to you, but feel free to reassign)