docs: update README.md for csignumf usage and 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: Deepak91168

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

@@ -2,7 +2,7 @@
 
 @license Apache-2.0
 
-Copyright (c) 2025 The Stdlib Authors.
+Copyright (c) 2018 The Stdlib Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -22,16 +22,12 @@ limitations under the License.
 
 > Evaluate the [signum][signum] function of a single-precision complex floating-point number.
 
-<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
-
 <section class="intro">
 
 </section>
 
 <!-- /.intro -->
 
-<!-- Package usage documentation. -->
-
 <section class="usage">
 
 ## Usage
@@ -77,26 +73,44 @@ im = imag( v );
 // returns NaN
 ```
 
-</section>
+#### csignumf.assign( re, im, out, strideOut, offsetOut )
 
-<!-- /.usage -->
+Evaluates the signum function and assigns the result to a provided output array.
 
-<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+```javascript
+var Float32Array = require( '@stdlib/array/float32' );
 
-<section class="notes">
+var out = new Float32Array( 2 );
+var v = csignumf.assign( -4.2, 5.5, out, 1, 0 );
+// returns <Float32Array>[ ~-0.607, ~0.795 ]
 
-</section>
+var bool = ( out === v );
+// returns true
+```
 
-<!-- /.notes -->
+#### csignumf.strided( z, sz, oz, out, so, oo )
 
-<!-- Package usage examples. -->
+Evaluates the signum function for single-precision complex numbers stored in a real-valued strided array and assigns results to a strided output array.
+
+```javascript
+var Float32Array = require( '@stdlib/array/float32' );
+
+var z = new Float32Array( [ -4.2, 5.5 ] );
+var out = new Float32Array( 2 );
+
+var v = csignumf.strided( z, 1, 0, out, 1, 0 );
+// returns <Float32Array>[ ~-0.607, ~0.795 ]
+
+var bool = ( out === v );
+// returns true
+```
+
+</section>
 
 <section class="examples">
 
 ## Examples
 
-<!-- eslint no-undef: "error" -->
-
 ```javascript
 var uniform = require( '@stdlib/random/base/uniform' ).factory;
 var Complex64 = require( '@stdlib/complex/float32/ctor' );