docs: update comment

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/blas/base/dsyr/README.md

@@ -288,7 +288,7 @@ int main( void ) {
         3.0, 2.0, 1.0
     };
 
-    // Define `x` vector:
+    // Define a vector:
     const double x[ 3 ] = { 1.0, 2.0, 3.0 };
 
     // Specify the number of elements along each dimension of `A1` and `A2`: