[matter] Fix image links

[jlaur]

Unfortunately all four images are broken after #19470. I don't know why, since other README's have similar links:

[openhab-addons]$ grep -R --include="README.md" "<img " | grep "src=\"doc".
bundles/org.openhab.binding.modbus.e3dc/README.md:<img align="right" src="doc/E3DC_Modbus_Settings.png" alt="E3DC Modbus Settings"/>
bundles/org.openhab.binding.modbus.e3dc/README.md:<img align="right" src="doc/GrafanaPV.png" alt="Grafana PV monitoring dashboard"/>
bundles/org.openhab.binding.modbus.e3dc/README.md:<img align="right" src="doc/GrafanaCloudiness.png" alt="Grafana cloudiness forecast dashboard"/>
bundles/org.openhab.binding.mybmw/README.md:<img align="right" src="doc/vehicle-properties.png" alt="Vehicle properties overview" width="500" height="350"/>
bundles/org.openhab.binding.mybmw/README.md:<img align="right" src="doc/RawData.png" alt="Raw data example" width="400" height="125"/>
bundles/org.openhab.binding.mybmw/README.md:<img align="right" src="doc/SessionOptions.png" alt="Session options example" width="400" height="250"/>
bundles/org.openhab.binding.mybmw/README.md:<img align="right" src="doc/range-radius.png" alt="Range radius example" width="400" height="350"/>
bundles/org.openhab.binding.solarforecast/README.md:<img src="doc/APICountTransformation.png" alt="API Count Transformation Example" width="320" height="300"/>
bundles/org.openhab.binding.pegelonline/README.md:<img align="right" src="doc/Marburg.png" alt="Marburg water level measurement station" width="450" height="500"/>
bundles/org.openhab.binding.matter/README.md:<img src="doc/pairing.png" alt="Matter Pairing" width="600"/>
bundles/org.openhab.binding.matter/README.md:<img src="doc/thing-discovery.png" alt="Thing Discovery" width="600"/>
bundles/org.openhab.binding.matter/README.md:<img src="doc/bridge-settings.png" alt="Bridge Settings" width="500"/>
bundles/org.openhab.binding.matter/README.md:<img src="doc/bridge-settings-pair.png" alt="Commissioning Window" width="500"/>

I don't have time to dig further into this at the moment, so just trying to fix what I broke (and now hopefully the other two images as well).

[lsiepel]

Let's try this.
LGTM

[jlaur]

Finally they are all working.