Update E0121.md

diff --git a/src/librustc_error_codes/error_codes/E0121.md b/src/librustc_error_codes/error_codes/E0121.md
index 6c20b2803cbe361b643576c44a6e9a0c0b37ba6e..06fe396d50d3b2d5dac334ec7fdf8482adf1786b 100644 (file)
--- a/src/librustc_error_codes/error_codes/E0121.md
+++ b/src/librustc_error_codes/error_codes/E0121.md
@@ -1,4 +1,4 @@
-The type placeholder `_` was used withing a type on an item's signature.
+The type placeholder `_` was used within a type on an item's signature.
 
 Erroneous code example: