language.namespaces.rationale first example doesn't actually explain what it is showing

On manual page: https://php.net/language.namespaces.rationale

This starts with an opening example Example #1 Namespace syntax example as defined in the docs code here.

However, this example block is hard to understand, and at present comes across as a bit of a dump of random examples without explanation. I think few newcomers to namespaces would understand what is being portrayed.

Issues are:

• The title is 'Namespace syntax example' which implies a complete example how to create a namespace
• It is unclear whether this is showing a range of examples, or whether this is intended to form a single script showing typical usage
• Several of the sections in it have no description, so the reader is expected to figure out what is being shown despite the purpose of the page being an introduction
• Some of the variables, e.g. $a, are reused within this block, implying that they are related.
• The comment about global space isn't obviously referring to the starting \ character

Basically I think this section would be better rewritten for each example to have a comment on the line before summarising that language feature, and then the demonstration of the feature, and no re-use of variables, to avoid confusion.

Thank you to all contributors for the otherwise excellent documentation throughout the manual.

Start with language/namespaces.xml lines 53-70 and compare the current Example #1 with the language.namespaces.rationale manual page. Rewrite the example so each demonstrated feature has an explanatory comment, unrelated variables are not reused, and the global-space comment is explicit. Done means the opening example clearly introduces the namespace syntax without looking like a random collection of snippets.