docs: add return annotations to README examples

---
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: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: anandkaranubc

lib/node_modules/@stdlib/number/float64/base/ulp-difference/README.md

@@ -98,18 +98,23 @@ var ulpdiff = require( '@stdlib/number/float64/base/ulp-difference' );
 
 var d = ulpdiff( 1.0, 1.0+EPS );
 console.log( d );
+// => 1.0
 
 d = ulpdiff( 5.8364e-319, 5.8367e-319 );
 console.log( d );
+// => 6.0
 
 d = ulpdiff( 0.0, SMALLEST_SUBNORMAL );
 console.log( d );
+// => 1.0
 
 d = ulpdiff( 0.0, -0.0 );
 console.log( d );
+// => 0.0
 
 d = ulpdiff( SMALLEST_SUBNORMAL, -SMALLEST_SUBNORMAL );
 console.log( d );
+// => 2.0
 ```
 
 </section>