ptx: add link (#5589)

tldr-pages · Mar 30, 2021 · 230f9e2 · 230f9e2
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diff --git a/pages/linux/ptx.md b/pages/linux/ptx.md
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 # ptx
 
 > Generate a permuted index of words from one or more text files.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/ptx-invocation.html>.
 
 - Generate a permuted index where the first field of each line is an index reference: