README.md: update link to the official docs

Author: PMeira

README.md

@@ -121,13 +121,7 @@ Remember that this package is meant to be a drop-in replacement for the official
 1. The basic MATLAB `help` command can be used to get a list of functions and properties available in the objects. 
 2. The DSS-Python reference can be useful for discoverability, e.g. [The DSS instance](https://dss-extensions.org/dss_python/#the-dss-instance). [DSS Sharp](https://dss-extensions.org/dss_sharp/) reference is also an alternative.
 3. We have an online document listing most DSS properties and commands at [DSS-Extensions: OpenDSS Commands and Properties](https://dss-extensions.org/dss_properties.html).
-4. This official OpenDSS COM lists the official API contents: [OpenDSSComDoc.pdf](https://sourceforge.net/p/electricdss/code/HEAD/tree/trunk/Version8/Distrib/Doc/OpenDSSComDoc.pdf?format=raw)
-5. There is another official document in a less accessible format that can be used for those still learning the basics, but remember we offer a wider range of features: [official OpenDSS_COM.chm on SourceForge](https://sourceforge.net/p/electricdss/code/HEAD/tree/trunk/Version8/Distrib/x64/OpenDSS_COM.chm?format=raw). This includes some basic examples of usage.
-
-This last one is a CHM file (Winhelp, compressed HTML files), Windows supports it natively.  
-On Linux, there are multiple CHM readers, such as KchmViewer — check your package manager or store for more.  
-On macOS, [this fork of iCHM](https://github.com/vit9696/iChm/releases/latest) works, and there are some alternatives in the Apple App Store.  
-Wine also comes with a CHM reader.
+4. This official OpenDSS COM lists the official API contents: https://opendss.epri.com/COMInterface.html
 
 ## Known differences and history