refactor: update C examples for consistency

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
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  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: passed
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    status: na
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    status: na
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    status: passed
---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/sinpi/examples/c/example.c

@@ -26,6 +26,6 @@ int main( void ) {
 	int i;
 	for ( i = 0; i < 5; i++ ) {
 		y = stdlib_base_sinpi( x[ i ] );
-		printf( "sinpi(%lf) = %lf\n", x[ i ], y );
+		printf( "sin( π * %lf ) = %lf\n", x[ i ], y );
 	}
 }