docs: update comments

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---

Author: kgryte

lib/node_modules/@stdlib/stats/strided/dztest/README.md

@@ -332,7 +332,7 @@ int main( void ) {
         .sd = 0.0
     };
 
-    // Compute a z-test:
+    // Compute a Z-test:
     stdlib_strided_dztest( N, STDLIB_STATS_ZTEST_TWO_SIDED, 0.05, 5.0, 3.0, x, strideX, &results );
 
     // Print the result:

lib/node_modules/@stdlib/stats/strided/dztest/examples/c/example.c

@@ -44,7 +44,7 @@ int main( void ) {
 		.sd = 0.0
 	};
 
-	// Compute a z-test:
+	// Compute a Z-test:
 	stdlib_strided_dztest( N, STDLIB_STATS_ZTEST_TWO_SIDED, 0.05, 5.0, 3.0, x, strideX, &results );
 
 	// Print the result: