Fix typos.

Author: sunfishcode

README.md

@@ -5,7 +5,7 @@ Caution: This is currently quite experimental and not generally usable yet!
 ## What is this?
 
 This is a "reference sysroot", which is meant to be part of a common C ABI
-that can be shared across C libraries and compilers. While it's intened to
+that can be shared across C libraries and compilers. While it's intended to
 (eventually) be usable in its own right, we fully expect other
 implementations to be used in practice by many different systems, though
 we do hope that in those cases, this library defines a useful ABI that can
@@ -19,7 +19,7 @@ Obtain a WebAssembly-supporting C compiler, and then run:
 make WASM_CC=/path/to/wasm/supporting/c/compiler
 ```
 
-This makes a directory called "sysroot", by default. See the top of the Makfile
+This makes a directory called "sysroot", by default. See the top of the Makefile
 for customization options.
 
 To use the sysroot, use the `--sysroot=` option: