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/usr/share/postgresql/9.5/tsearch_data/thesaurus_sample.ths is in postgresql-9.5 9.5.14-0ubuntu0.16.04.

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The actual contents of the file can be viewed below.

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#
# Theasurus config file. Character ':' separates string from replacement, eg
# sample-words : substitute-words
#
# Any substitute-word can be marked by preceding '*' character,
# which means do not lexize this word
# Docs: http://www.sai.msu.su/~megera/oddmuse/index.cgi/Thesaurus_dictionary

one two three : *123
one two : *12
one : *1
two : *2

supernovae stars : *sn
supernovae : *sn
booking tickets : order invitation cards
booking ? tickets : order invitation Cards