Remove unnecessary quotation marks in the examples.

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#### Description <!-- Describe your changes in detail -->

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/1999

-- Commit Summary --

* Update README

-- File Changes --

M src/modules/usrloc/README (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1999.patch https://github.com/kamailio/kamailio/pull/1999.diff