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doc: fix display of "problematic" ASCII characters
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When preparing output for a terminal that supports Unicode, Groff remaps
the following characters to typographically "fancier" versions:

    ^ (U+005E)  ->  ˆ (U+02C6)
    ~ (U+007E)  ->  ˜ (U+02DC)
    - (U+002D)  ->  ‐ (U+2010)
    ` (U+0060)  ->  ‘ (U+2018)
    ' (U+0027)  ->  ’ (U+2019)

This transformation is normally desirable in high-quality typeset output
(PDF and PostScript), but frequently problematic in terminal display. As
described in groff_char(7), the following escape sequences are needed to
display the aforementioned characters as they appear in source code:

    ^   ->   \(ha   (Mnemonic: "hat")
    ~   ->   \(ti   (Mnemonic: "tilde")
    -   ->   \-
    `   ->   \(ga   (Mnemonic: "grave accent")
    '   ->   \(aq   (Mnemonic: "apostrophe quote")

These constructs are cumbersome to write, obstruct readability of source
code, and are completely opaque to the majority of man page authors (who
only care about terminal display). A simpler solution is to use `.tr` to
translate these characters automatically.

PR-URL: #44373
Reviewed-By: James M Snell <[email protected]>
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@Alhadis @RafaelGSS
Alhadis authored and RafaelGSS committed Nov 10, 2022
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.\"
.\"======================================================================
.
.tr -\-^\(ha~\(ti`\(ga
.Dd 2018
.Dt NODE 1
.
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