Update equation

Author: kgryte

lib/node_modules/@stdlib/blas/base/snrm2/README.md

@@ -26,9 +26,9 @@ limitations under the License.
 
 The [L2-norm][l2-norm] is defined as
 
-<!-- <equation class="equation" label="eq:l2_norm" align="center raw="\|\mathbf{x}\|_2 = \sqrt{\mathbf{x}^T\mathbf{x}}" alt="L2-norm definition."> -->
+<!-- <equation class="equation" label="eq:l2_norm" align="center raw="\|\mathbf{x}\|_2 = \sqrt{x_0^2 + x_1^2 + \ldots + x_{N-1}^2}" alt="L2-norm definition."> -->
 
-<div class="equation" align="center" data-raw-text="\|\mathbf{x}\|_2 = \sqrt{\mathbf{x}^T\mathbf{x}}" data-equation="eq:l2_norm">
+<div class="equation" align="center" data-raw-text="\|\mathbf{x}\|_2 = \sqrt{x_0^2 + x_1^2 + \ldots + x_{N-1}^2}" data-equation="eq:l2_norm">
     <img src="https://cdn.rawgit.com/stdlib-js/stdlib/19e5f15ab257f0018399b51e1b16b9b132233829/lib/node_modules/@stdlib/blas/base/snrm2/docs/img/equation_l2_norm.svg" alt="L2-norm definition.">
     <br>
 </div>