Update solo-extras.md

Author: conorpp

docs/solo/solo-extras.md

@@ -3,7 +3,7 @@
 ## Random number generation
 
 Solo contains a True Random Number Generator (TRNG).  A TRNG is a hardware based mechanism
-that leverages natural phenomenon to generate random numbers, which is often better than a traditional
+that leverages natural phenomenon to generate random numbers, which is can be better than a traditional
 RNG that has state and updates deterministically using cryptographic methods.
 
 You can easily access the TRNG stream on Solo using our python tool [solo-python](https://github.com/solokeys/solo-python).