Adds missing line break (#6309)

Adds small fix to the docs. Line 67 specifies "two key changes". I think this is where the second bullet point was meant to start.

docs/introduction/what-is-tendermint.md

@@ -68,11 +68,11 @@ Tendermint is in essence similar software, but with two key differences:
 
 - It is Byzantine Fault Tolerant, meaning it can only tolerate up to a
   1/3 of failures, but those failures can include arbitrary behaviour -
-  including hacking and malicious attacks. - It does not specify a
-  particular application, like a fancy key-value store. Instead, it
-  focuses on arbitrary state machine replication, so developers can build
-  the application logic that's right for them, from key-value store to
-  cryptocurrency to e-voting platform and beyond.
+  including hacking and malicious attacks. 
+- It does not specify a particular application, like a fancy key-value 
+  store. Instead, it focuses on arbitrary state machine replication, 
+  so developers can build the application logic that's right for them, 
+  from key-value store to cryptocurrency to e-voting platform and beyond.
 
 ### Bitcoin, Ethereum, etc