Update RELEASE_NOTES.md

RELEASE_NOTES.md

@@ -1,7 +1,7 @@
 # Eclipse Signalling Engineering Toolbox: Release notes 
 The Eclipse Signalling Engineering Toolbox provides means for initialization, managing, testing, validation, visualization, documentation and merging of instances of the object model for the railway interlocking signalling technology.
 ## 2.3
-- Initial implementation of the Overview Plan, which provides an abstract visualization of the topology.
+- Initial implementation of the Overview Plan, which provides an abstract visualization of the topology. 
 - Importing of existing data into other planning projects
 - Initial implementation of the ETCS Tables (Ssza, Sszs, Sszw)
 - All ESTW tables displayed separately according to setting ranges via a selection box (note: this selection has no influence on the ETCS tables).