added function help for the logarithm functions

Author: lynxlynxlynx

resources/function_help/ln-en_US

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+<h3>ln() function</h3>
+Returns the value of the natural logarithm of the passed expression.
+<br>
+This function takes one argument.
+<h4>Syntax</h4>
+<code>ln(value)</code><br>
+
+<h4>Arguments</h4>
+<code>value</code> - any positive number.
+<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+<code>ln(1) &rarr; 0</code><br>
+<code>ln(e) &rarr; 1</code><br>

resources/function_help/log-en_US

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+<h3>log() function</h3>
+Returns the value of the logarithm of the passed value and base.
+<br>
+This function takes two arguments.
+<h4>Syntax</h4>
+<code>log(base, value)</code><br>
+
+<h4>Arguments</h4>
+<code>base</code> - any positive number.
+<code>value</code> - any positive number.
+<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+<code>log(2, 32) &rarr; 5</code><br>
+<code>log(0.5, 32) &rarr; -5</code><br>

resources/function_help/log10-en_US

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+<h3>log10() function</h3>
+Returns the value of the base 10 logarithm of the passed expression.
+<br>
+This function takes one argument.
+<h4>Syntax</h4>
+<code>log10(value)</code><br>
+
+<h4>Arguments</h4>
+<code>value</code> - any positive number.
+<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+<code>log10(1) &rarr; 0</code><br>
+<code>log10(100) &rarr; 2</code><br>