test: update description to use correct term for lambda

---
type: pre_commit_static_analysis_report
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    status: passed
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    status: passed
---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/exponential/mean/test/test.js

@@ -45,7 +45,7 @@ tape( 'if provided `NaN` for `lambda`, the function returns `NaN`', function tes
 	t.end();
 });
 
-tape( 'if provided a mean parameter `lambda` that is not a nonnegative number, the function returns `NaN`', function test( t ) {
+tape( 'if provided a rate parameter `lambda` that is not a nonnegative number, the function returns `NaN`', function test( t ) {
 	var v;
 
 	v = mean( -1.0 );