docs: fix function signature

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Author: anandkaranubc

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

@@ -148,7 +148,7 @@ The function accepts the following arguments:
 -   **cphase**: `[out] double*` destination for the phase value in radians.
 
 ```c
-double stdlib_base_cpolar( const stdlib_complex128_t z, double *cabs, double *cphase );
+void stdlib_base_cpolar( const stdlib_complex128_t z, double *cabs, double *cphase );
 ```
 
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