Update of README with new sanitizer usage possibilities

Author: rlalik

README.md

@@ -85,16 +85,16 @@ A quick rundown of the tools available, and what they do:
     - Unreachable code
 - [MemorySanitizer](https://clang.llvm.org/docs/MemorySanitizer.html) detects uninitialized reads.
 
-These are used by declaring the `USE_SANITIZER` CMake variable as one of:
+These are used by declaring the `USE_SANITIZER` CMake variable as string containing any of:
 - Address
 - Memory
 - MemoryWithOrigins
 - Undefined
 - Thread
-- Address;Undefined
-- Undefined;Address
 - Leak
 
+Multiple values are allowed, e.g. `-DUSE_SANITIZER=Address,Leak` but some sanitizers cannot be combined together, e.g.`-DUSE_SANITIZER=Address,Memory` will result in configuration error. The delimeter character is not required and `-DUSE_SANITIZER=AddressLeak` would work as well.
+
 ## Code Coverage [`code-coverage.cmake`](code-coverage.cmake)
 
 ![Code Coverage Examples](img/code-cov.png)
@@ -362,4 +362,4 @@ Doesn't work with GCC.
 ### Optional Arguments
 
 #### REQUIRED
-If this is passed in, CMake configuration will fail with an error if LTO/IPO is not supported
+If this is passed in, CMake configuration will fail with an error if LTO/IPO is not supported