docs: define matrix A clearly

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Author: prajjwalbajpai

lib/node_modules/@stdlib/lapack/base/dlasv2/README.md

@@ -24,7 +24,7 @@ limitations under the License.
 
 <section class="intro">
 
-The singular value decomposition of a 2x2 upper triangular matrix $ \begin{bmatrix} F & G \\ 0 & H \end{bmatrix}$ is given by
+The singular value decomposition of a 2x2 upper triangular matrix $ A = \begin{bmatrix} F & G \\ 0 & H \end{bmatrix}$ is given by
 
 <!-- <equation class="equation" label="eq:dlasv2_svd" align="center" raw="\left[\begin{array}{rr} \mathrm{CSL} & \mathrm{SNL} \\ -\mathrm{SNL} & \mathrm{CSL} \end{array}\right] \left[\begin{array}{rr} F & G \\ 0 & H \end{array}\right] \left[\begin{array}{rr} \mathrm{CSR} & -\mathrm{SNR} \\ \mathrm{SNR} & \mathrm{CSR} \end{array}\right] = \left[\begin{array}{rr} \mathrm{SSMAX} & 0 \\ 0 & \mathrm{SSMIN} \end{array}\right]" alt="Singular value decomposition of a 2x2 upper triangular matrix."> -->