[llvm] NFC: fix trivial typos in documents

Reviewers: hans, Jim

Reviewed By: Jim

Subscribers: jvesely, nhaehnle, mgorny, arphaman, bmahjour, kerbowa, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D73017
diff --git a/llvm/docs/CommandGuide/tblgen.rst b/llvm/docs/CommandGuide/tblgen.rst
index 372d1b2..2a468fa 100644
--- a/llvm/docs/CommandGuide/tblgen.rst
+++ b/llvm/docs/CommandGuide/tblgen.rst
@@ -98,7 +98,7 @@
 
 .. option:: -gen-dag-isel
 
- Generate a DAG (Directed Acycle Graph) instruction selector.
+ Generate a DAG (Directed Acyclic Graph) instruction selector.
 
 .. option:: -gen-asm-matcher