Fix typos; snapshot size

This commit fixes 'automaticly', 'mega byte', 'terra byte'.

It also changes 'will be far less than a mega byte' to 'should be
less than a megabyte'. The reason for 'should' is that in some
cases, providing a small data set in the package is useful, as in
[1]. Of course, [1] would be only 0.9 Mb in size, including the
data sets, instead of 1.3 Mb, if the author, whoever that may
happen to be, had excluded the useless (produced) file
'paper-tmp.eps'. :P  Case [2] is 0.4 Mb.

These two tar archives are for ArXiv, so they also contain
produced .eps files. So maybe in principle 'far less than'
is right. However, on neither [3] nor [4], trying to follow
the recommendations :), are any of the "useful" versions of
single file archives smaller than the ArXiv version. The
git bundles are bigger because of the git history, and the
'software' archives are 0.5 to 0.6 Gb because they include
almost everything.

However, stating something that is possible in principle but
not done in practice would be misleading. So I would not include
'far less'.

[1] https://zenodo.org/record/3951152/files/subpoisson-252cf1c-arXiv.tar.gz
[2] https://zenodo.org/record/4062461/files/elaphrocentre-724a7c8-arXiv.tar.gz
[3] https://zenodo.org/record/3951152
[4] https://zenodo.org/record/4062461

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