feat: adding the value of pi-squared for float16 chores

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---

Author: DivyanshuVortex

lib/node_modules/@stdlib/constants/float16/pi-squared/test/test.js

@@ -25,7 +25,7 @@ var pow = require( '@stdlib/math/base/special/pow' );
 var absf = require( '@stdlib/math/base/special/absf' );
 var float64ToFloat16 = require( '@stdlib/number/float64/base/to-float16' );
 var EPS = require( '@stdlib/constants/float16/eps' );
-var PI = require( '@stdlib/constants/float16/pi' );
+var PI = require( '@stdlib/constants/float32/pi' );
 var FLOAT16_PI_SQUARED = require( './../lib' );
 
 
@@ -37,7 +37,7 @@ tape( 'main export is a number', function test( t ) {
 	t.end();
 });
 
-tape( 'export is a single-precision floating-point number equal to 9.8671875', function test( t ) {
+tape( 'export is a half-precision floating-point number equal to 9.8671875', function test( t ) {
 	t.strictEqual( FLOAT16_PI_SQUARED, 9.8671875, 'returns expected value' );
 	t.end();
 });