build/toolchain: fix a few typos while driving by

Change-Id: I7e0dd8bea122990143619d69e312f0f67f3b3a7f
Reviewed-on: https://review.monogon.dev/c/monogon/+/1032
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Tested-by: Leopold Schabel <leo@monogon.tech>
diff --git a/build/toolchain/musl-host-gcc/README.md b/build/toolchain/musl-host-gcc/README.md
index 27642fb..367b4a7 100644
--- a/build/toolchain/musl-host-gcc/README.md
+++ b/build/toolchain/musl-host-gcc/README.md
@@ -10,7 +10,7 @@
 Usage
 -----
 
-To use this toolchain explicitely while building a `cc_binary`, do:
+To use this toolchain explicitly while building a `cc_binary`, do:
 
     bazel build --crosstool_top=//build/toolchain/musl-host-gcc:musl_host_cc_suite //foo/bar