Rollup merge of rust-lang#38073 - cardoe:fix-typo, r=frewsxcv

bootstrap/README: fix small typo

Author: dns2utf8

src/bootstrap/README.md

@@ -32,7 +32,7 @@ The script accepts commands, flags, and filters to determine what to do:
   # build the whole compiler
   ./x.py build
 
-  # build the stage1 compier
+  # build the stage1 compiler
   ./x.py build --stage 1
 
   # build stage0 libstd