docs: add missing headings and add missing placeholder section

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

@@ -76,6 +76,8 @@ var bool = ( y === out );
 
 <section class="examples">
 
+## Examples
+
 ```javascript
 var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
 var drotg = require( '@stdlib/blas/base/drotg' );

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

@@ -76,6 +76,8 @@ var bool = ( y === out );
 
 <section class="examples">
 
+## Examples
+
 ```javascript
 var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
 var srotg = require( '@stdlib/blas/base/srotg' );

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

@@ -295,6 +295,14 @@ int main( void ) {
 
 <!-- /.c -->
 
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
 <!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="links">