chore: add appropriate comments for example

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---

Author: ShabiShett07

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

@@ -273,7 +273,7 @@ void c_dtrmv_ndarray( const CBLAS_UPLO uplo, const CBLAS_TRANSPOSE trans, const
 #include <stdio.h>
 
 int main( void ) {
-    // Define a 3x3 matrix stored in row-major order:
+    // Define a 3x3 triangular matrix stored in row-major order:
     const double A[ 3*3 ] = {
         1.0, 0.0, 0.0,
         2.0, 1.0, 0.0,
@@ -285,15 +285,15 @@ int main( void ) {
     // Specify the number of elements along each dimension of `A`:
     const int N = 3;
 
-    // Perform the matrix-vector operations `y = α*A*x + β*y`:
+    // Perform the matrix-vector operations `x = A*x`:
     c_dtrmv( CblasRowMajor, CblasUpper, CblasNoTrans, CblasUnit, N, A, N, x, 1 );
 
     // Print the result:
     for ( int i = 0; i < N; i++ ) {
         printf( "x[ %i ] = %lf\n", i, x[ i ] );
     }
 
-    // Perform the symmetric rank 2 operation `A = α*x*y^T + α*y*x^T + A`:
+    // Perform the matrix-vector operations `x = A*x` using alternative indexing semantics:
     c_dtrmv_ndarray( CblasUpper, CblasNoTrans, CblasUnit, 3, A, 3, 1, 0, x, 1, 0 );
 
     // Print the result:

lib/node_modules/@stdlib/blas/base/dtrmv/examples/c/example.c

@@ -21,7 +21,7 @@
 #include <stdio.h>
 
 int main( void ) {
-	// Define a 3x3 matrix stored in row-major order:
+	// Define a 3x3 triangular matrix stored in row-major order:
 	const double A[ 3*3 ] = {
 		1.0, 0.0, 0.0,
 		2.0, 1.0, 0.0,
@@ -33,15 +33,15 @@ int main( void ) {
 	// Specify the number of elements along each dimension of `A`:
 	const int N = 3;
 
-	// Perform the matrix-vector operations `y = α*A*x + β*y`:
+	// Perform the matrix-vector operations `x = A*x`:
 	c_dtrmv( CblasRowMajor, CblasUpper, CblasNoTrans, CblasUnit, N, A, N, x, 1 );
 
 	// Print the result:
 	for ( int i = 0; i < N; i++ ) {
 		printf( "x[ %i ] = %lf\n", i, x[ i ] );
 	}
 
-	// Perform the symmetric rank 2 operation `A = α*x*y^T + α*y*x^T + A`:
+	// Perform the matrix-vector operations `x = A*x` using alternative indexing semantics:
 	c_dtrmv_ndarray( CblasUpper, CblasNoTrans, CblasUnit, 3, A, 3, 1, 0, x, 1, 0 );
 
 	// Print the result: