remove: remove subf from namespace

This commit removes the `subf` symbol from the `@stdlib/math/base/ops`
namespace due to a package migration.

BREAKING CHANGE: remove `subf`

To migrate, users should access the same symbol via the
`@stdlib/number/float32/base` namespace.

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
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    status: passed
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    status: passed
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    status: passed
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---

Author: gururaj1512

lib/node_modules/@stdlib/math/base/ops/docs/types/index.d.ts

@@ -32,7 +32,6 @@ import csubf = require( '@stdlib/math/base/ops/csubf' );
 import imul = require( '@stdlib/math/base/ops/imul' );
 import imuldw = require( '@stdlib/math/base/ops/imuldw' );
 import mulf = require( '@stdlib/number/float32/base/mul' );
-import subf = require( '@stdlib/math/base/ops/subf' );
 import umul = require( '@stdlib/math/base/ops/umul' );
 import umuldw = require( '@stdlib/math/base/ops/umuldw' );
 import addf = require( '@stdlib/number/float32/base/add' );
@@ -476,35 +475,6 @@ interface Namespace {
 	*/
 	mulf: typeof mulf;
 
-	/**
-	* Subtracts two single-precision floating-point numbers `x` and `y`.
-	*
-	* @param x - first input value
-	* @param y - second input value
-	* @returns result
-	*
-	* @example
-	* var v = ns.subf( -1.0, 5.0 );
-	* // returns -6.0
-	*
-	* @example
-	* var v = ns.subf( 2.0, 5.0 );
-	* // returns -3.0
-	*
-	* @example
-	* var v = ns.subf( 0.0, 5.0 );
-	* // returns -5.0
-	*
-	* @example
-	* var v = ns.subf( -0.0, 0.0 );
-	* // returns -0.0
-	*
-	* @example
-	* var v = ns.subf( NaN, NaN );
-	* // returns NaN
-	*/
-	subf: typeof subf;
-
 	/**
 	* Performs C-like multiplication of two unsigned 32-bit integers.
 	*

lib/node_modules/@stdlib/math/base/ops/lib/index.js

@@ -135,15 +135,6 @@ setReadOnly( ns, 'imul', require( '@stdlib/math/base/ops/imul' ) );
 */
 setReadOnly( ns, 'imuldw', require( '@stdlib/math/base/ops/imuldw' ) );
 
-/**
-* @name subf
-* @memberof ns
-* @readonly
-* @type {Function}
-* @see {@link module:@stdlib/math/base/ops/subf}
-*/
-setReadOnly( ns, 'subf', require( '@stdlib/math/base/ops/subf' ) );
-
 /**
 * @name umul
 * @memberof ns