drop docs for 2 functions removed from Lua
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@ -3961,20 +3961,6 @@ this value is exactly <code>t2</code><em>-</em><code>t1</code>.
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<p>
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<hr><h3><a name="pdf-os.execute"><code>os.execute ([command])</code></a></h3>
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<p>
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This function is equivalent to the C function <code>system</code>.
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It passes <code>command</code> to be executed by an operating system shell.
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It returns a status code, which is system-dependent.
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If <code>command</code> is absent, then it returns nonzero if a shell is available
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and zero otherwise.
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<p>
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<hr><h3><a name="pdf-os.exit"><code>os.exit ([code])</code></a></h3>
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@ -3988,17 +3974,6 @@ The default value for <code>code</code> is the success code.
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<p>
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<hr><h3><a name="pdf-os.getenv"><code>os.getenv (varname)</code></a></h3>
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<p>
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Returns the value of the process environment variable <code>varname</code>,
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or <b>nil</b> if the variable is not defined.
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<p>
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<hr><h3><a name="pdf-os.remove"><code>os.remove (filename)</code></a></h3>
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