docs: fix copy

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

Author: kgryte

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

@@ -137,7 +137,7 @@ AB = \left[
 
 <!-- </equation> -->
 
-`AB` is a 3×5 matrix is 3×5 as `KD+1 = 2+1 = 3`. Similarly, given the following matrix `A`,
+`AB` is a 3×5 matrix as `KD+1 = 2+1 = 3`. Similarly, given the following matrix `A`,
 
 <!-- <equation class="equation" label="eq:symmetric_lower_a" align="center" raw="A = \left[\begin{array}{rrrrr}a_{11} & {a_{21}} & {a_{31}} & 0      & 0 \\a_{21} & a_{22} & {a_{32}} & {a_{42}} & 0 \\a_{31} & a_{32} & a_{33} & {a_{43}} & {a_{53}} \\0      & a_{42} & a_{43} & a_{44} & {a_{54}} \\0      & 0      & a_{53} & a_{54} & a_{55}\end{array}\right]" alt="Representation of symmetric band matrix A (lower triangle)."> -->