chore: align stats/base/dists/lognormal/logpdf package description with namespace majority

Normalize `package.json` `description` to the `"Lognormal distribution
{noun}."` pattern used by 12/14 siblings in the
`stats/base/dists/lognormal` namespace (85.7% conformance), and matching
the dominant `"{Dist} distribution logarithm of probability density
function (PDF)."` template used across `gamma`, `beta`, `gumbel`,
`laplace`, `logistic`, `rayleigh`, and `weibull`.

No source, test, or behavioral changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016MpvUVp4pvm7okW5UysayX

Author: claude

lib/node_modules/@stdlib/stats/base/dists/lognormal/logpdf/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@stdlib/stats/base/dists/lognormal/logpdf",
   "version": "0.0.0",
-  "description": "Natural logarithm of the probability density function (PDF) for a lognormal distribution.",
+  "description": "Lognormal distribution logarithm of probability density function (PDF).",
   "license": "Apache-2.0",
   "author": {
     "name": "The Stdlib Authors",