docs: add missing section closing comments in READMEs

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: passed
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Planeshifter

lib/node_modules/@stdlib/_tools/remark/plugins/remark-namespace-toc/examples/fixtures/asinh/README.md

@@ -91,6 +91,8 @@ v = asinh( Infinity );
 
 </section>
 
+<!-- /.notes -->
+
 <section class="examples">
 
 ## Examples

lib/node_modules/@stdlib/blas/ext/base/gsort2hp/README.md

@@ -192,6 +192,8 @@ console.log( y );
 
 </section>
 
+<!-- /.references -->
+
 <section class="links">
 
 [mdn-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

lib/node_modules/@stdlib/constants/float16/pi-squared/README.md

@@ -60,6 +60,8 @@ console.log( FLOAT16_PI_SQUARED );
 
 </section>
 
+<!-- /.examples -->
+
 <section class="related">
 
 </section>

lib/node_modules/@stdlib/math/base/special/secf/README.md

@@ -26,6 +26,8 @@ limitations under the License.
 
 </section>
 
+<!-- /.intro -->
+
 <section class="usage">
 
 ## Usage

lib/node_modules/@stdlib/process/getegid/README.md

@@ -51,6 +51,8 @@ var id = getegid();
 
 </section>
 
+<!-- /.notes -->
+
 <section class="examples">
 
 ## Examples

lib/node_modules/@stdlib/process/geteuid/README.md

@@ -51,6 +51,8 @@ var id = geteuid();
 
 </section>
 
+<!-- /.notes -->
+
 <section class="examples">
 
 ## Examples

lib/node_modules/@stdlib/process/getgid/README.md

@@ -51,6 +51,8 @@ var id = getgid();
 
 </section>
 
+<!-- /.notes -->
+
 <section class="examples">
 
 ## Examples

lib/node_modules/@stdlib/process/getuid/README.md

@@ -51,6 +51,8 @@ var id = getuid();
 
 </section>
 
+<!-- /.notes -->
+
 <section class="examples">
 
 ## Examples

lib/node_modules/@stdlib/stats/base/dists/arcsine/pdf/README.md

@@ -131,6 +131,8 @@ logEachMap( 'x: %0.4f, a: %0.4f, b: %0.4f, f(x;a,b): %0.4f', x, a, b, pdf );
 
 </section>
 
+<!-- /.examples -->
+
 <!-- C interface documentation. -->
 
 * * *

lib/node_modules/@stdlib/stats/base/dists/laplace/mean/README.md

@@ -126,6 +126,8 @@ logEachMap( 'µ: %0.4f, b: %0.4f, E(X;µ,b): %0.4f', mu, b, mean );
 
 </section>
 
+<!-- /.examples -->
+
 <!-- C interface documentation. -->
 
 * * *