Rewrite description for URL alias on node/add/*

Problem/Motivation

The wording of the help text for URL alias when creating a node (add content > page or aerticle, then click the URL alias tab) is overdone. It should be simplified and clarified.

Proposed resolution

Simplify the wording to
The alternative URL for this content. For example, type "about" when creating an about page. Use a relative path without a trailing slash.

Remaining tasks

patch needs to be created.

User interface changes

Help text for URL alias setting on node/add/* should be
The alternative URL for this content. For example, type "about" when creating an about page. Use a relative path without a trailing slash.

API changes

none

Original report by add1sun

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Current:

Optionally specify an alternative URL by which this content can be accessed. For example, type "about" when writing an about page. Use a relative path and don't add a trailing slash or the URL alias won't work.

Proposed:

The alternative URL for this content. For example, type "about" when creating an about page. Use a relative path without a trailing slash.