[map] Update README.md (#9886)

* Update README.md

Signed-off-by: xi <hugo.boss2997@gmail.com>

* Update bundles/org.openhab.transform.map/README.md

Signed-off-by: Fabian Wolter <github@fabian-wolter.de>

Co-authored-by: Fabian Wolter <github@fabian-wolter.de>
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# Map Transformation Service
Transforms the input by mapping it to another string. It expects the mappings to be read from a file which is stored under the `transform` folder.
Transforms the input by mapping it to another string. It expects the mappings to be read from a file which is stored under the `transform` folder.
The file name must have the `.map` extension.
This file should be in property syntax, i.e. simple lines with "key=value" pairs.
The file format is documented [here](https://docs.oracle.com/javase/8/docs/api/java/util/Properties.html#load-java.io.Reader-).