Merge pull request #889 from amoghg/patch-1

Fix grammar in memory model

Author: ehuss

src/memory-model.md

@@ -1,5 +1,5 @@
 # Memory model
 
-Rust does not yet have a defined memory model. Various academics and industry
+Rust does not yet have a defined memory model. Various academics and industry professionals
 are working on various proposals, but for now, this is an under-defined place
 in the language.