En dash in front of long options in man page

[l0b0]

For bugs

• My shellcheck version: 0.5.0

Here's a snippet that shows the problem:

$ man shellcheck | grep '–'
       -a, –check-sourced
       -C[WHEN], –color[=WHEN]
              For TTY output, enable colors always, never or auto.  The default is auto.  –color without an argument
              is equivalent to –color=always.
       -e CODE1[,CODE2...], –exclude=CODE1[,CODE2...]
       -f FORMAT, –format=FORMAT
       -s shell, –shell=shell
       -V, –version
       -x, –external-sources

Here's what shellcheck currently says:

The long options shown above are prefixed with – (en dash). If I copy one of those options verbatim it's treated as a file:

$ shellcheck –check-sourced *.sh 
–check-sourced: –check-sourced: openBinaryFile: does not exist (No such file or directory)

Here's what I wanted or expected to see:

All the long options should be prefixed with -- (two hyphens).