docs: remove stray character in blas/ext/base/dapx documentation

PR-URL: #3250

Reviewed-by: Philipp Burckhardt <[email protected]>

Author: headlessNode

lib/node_modules/@stdlib/blas/ext/base/dapx/README.md

@@ -260,7 +260,7 @@ int main( void ) {
 
 </section>
 
-W<!-- /.c -->
+<!-- /.c -->
 
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