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Describe "^instruction" in documentation

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GhidraDocs/languages/html/sleigh_constructors.html
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@ -262,6 +262,20 @@ mnemonic, rather than perhaps a later part, needs to be considered as
an operand. An initial ‘^’ character can also facilitate certain
recursive constructions.
</p>
<div class="informalexample"><pre class="programlisting">
:^instruction is <span class="weak">...</span>
</pre></div>
<p>
</p>
<p>
In the example above, the ‘^’ character is prepended to the reserved
<span class="emphasis"><em>instruction</em></span> identifier to create
a “pure recursive” constructor. Constructors of this form are often employed
to perform generic actions for multiple instructions (such as handling instruction prefixes).
These constructors must be designed with care, as infinite recursion is possible with improper constraints
(see <a class="xref" href="sleigh_constructors.html#sleigh_constraints" title="7.4.1. Constraints">Section 7.4.1, “Constraints”</a> and
<a class="xref" href="sleigh_tokens.html#sleigh_context_variables" title="6.4. Context Variables">Section 6.4, “Context Variables”</a>).
</p>
</div>
</div>
<div class="sect2">