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treewide: adjust some DocBook for conversion
The NixOS variant of Markdown doesn't make a distinction between `<code>` and `<literal>` or `<quote>` and... quotes, and doesn't support `<parameter>` or `<replaceable>`. These are infrequently used (apart from `<code>`) and don't add much, so just convert them to simpler forms to allow the options containing them to be converted to Markdown automatically. A few minor syntactic adjustments were also made to make `nix-doc-munge`'s job easier.
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@@ -264,11 +264,11 @@ in
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The values may refer to other environment variables using
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POSIX.2 style variable references. For example, a variable
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<varname>parameter</varname> may be referenced as
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<code>$parameter</code> or <code>''${parameter}</code>. A
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<literal>$parameter</literal> or <literal>''${parameter}</literal>. A
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default value <literal>foo</literal> may be given as per
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<code>''${parameter:-foo}</code> and, similarly, an alternate
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<literal>''${parameter:-foo}</literal> and, similarly, an alternate
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value <literal>bar</literal> can be given as per
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<code>''${parameter:+bar}</code>.
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<literal>''${parameter:+bar}</literal>.
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</para><para>
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Note, these variables may be set in any order so no session
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variable may have a runtime dependency on another session
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@@ -314,9 +314,9 @@ in
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</para><para>
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These directories are added to the <envar>PATH</envar> variable in a
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double-quoted context, so expressions like <code>$HOME</code> are
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expanded by the shell. However, since expressions like <code>~</code> or
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<code>*</code> are escaped, they will end up in the <envar>PATH</envar>
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double-quoted context, so expressions like <literal>$HOME</literal> are
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expanded by the shell. However, since expressions like <literal>~</literal> or
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<literal>*</literal> are escaped, they will end up in the <envar>PATH</envar>
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verbatim.
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'';
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};
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