docs: update license header and remove stdlib include in math/base/special/trigamma

PR-URL: #2765

---------

Signed-off-by: Gunj Joshi <[email protected]>
Reviewed-by: Philipp Burckhardt <[email protected]>

Author: gunjjoshi

Diff for: lib/node_modules/@stdlib/math/base/special/trigamma/README.md

@@ -181,7 +181,6 @@ double stdlib_base_trigamma( const double x );
 
 ```c
 #include "stdlib/math/base/special/trigamma.h"
-#include <stdlib.h>
 #include <stdio.h>
 
 int main( void ) {

Diff for: lib/node_modules/@stdlib/math/base/special/trigamma/src/main.c

@@ -18,7 +18,7 @@
 *
 * ## Notice
 *
-* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_85_0/boost/math/special_functions/trigamma.hpp}. The implementation follows the original but has been reformatted and modified for JavaScript.
+* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_85_0/boost/math/special_functions/trigamma.hpp}. The implementation follows the original but has been reformatted and modified for use in stdlib.
 *
 * ```text
 * (C) Copyright John Maddock 2006.