chore: add missing 'the' in comment

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/sincosd/README.md

@@ -47,7 +47,7 @@ v = sincosd( -30.0 );
 
 #### sincosd.assign( x, out, stride, offset )
 
-Simultaneously computes the [sine][@stdlib/math/base/special/sind] and [cosine][@stdlib/math/base/special/cosd] of an `angle` measured in degrees and assigns results to a provided output array.
+Simultaneously computes the [sine][@stdlib/math/base/special/sind] and [cosine][@stdlib/math/base/special/cosd] of an `angle` measured in degrees and assigns the results to a provided output array.
 
 ```javascript
 var Float64Array = require( '@stdlib/array/float64' );