43651-type-parameters.md: add missing backquote

Change-Id: If29e34707f08d9418ae96e1b15badc1a1b84abcd
Reviewed-on: https://go-review.googlesource.com/c/proposal/+/348709
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/design/43651-type-parameters.md b/design/43651-type-parameters.md
index ce32a88..341124e 100644
--- a/design/43651-type-parameters.md
+++ b/design/43651-type-parameters.md
@@ -780,7 +780,7 @@
 We want it to work not just for slices of the predeclared ordered
 types, but also for types defined by a program.
 If a program uses `type MyString string`, the program can use the `<`
-operator with values of type `MyString.
+operator with values of type `MyString`.
 It should be possible to instantiate `Smallest` with the type
 `MyString`.