Fix typo

Author: phil-opp

content/this-month/2020-09.md

@@ -69,7 +69,7 @@ The crate received the following updates in September:
 
 Thanks to [@ecstatic-morse](https://github.com/ecstatic-morse), [@toku-sa-n](https://github.com/toku-sa-n), [@h33p](https://github.com/h33p), and [@josephlr](https://github.com/josephlr) for their contributions!
 
-We would also like to welcome [@josephlr](https://github.com/josephlr) to our `x86_64` review and maintainance team!
+We would also like to welcome [@josephlr](https://github.com/josephlr) to our `x86_64` review and maintenance team!
 
 ### [`volatile`](https://github.com/rust-osdev/volatile)
 
@@ -101,7 +101,7 @@ We also made some more progress on the rewrite with UEFI support. It now [passes
 
 ### [`cargo-xbuild`](https://github.com/rust-osdev/cargo-xbuild)
 
-The `cargo-xbuild` project provides `cargo` command wrappers to cross-compile the sysroot crates `core` and `alloc`. This month, we merged some maintainance updates to increase platform compatibility:
+The `cargo-xbuild` project provides `cargo` command wrappers to cross-compile the sysroot crates `core` and `alloc`. This month, we merged some maintenance updates to increase platform compatibility:
 
 - [Remove fs2 dependency for broader platform support](https://github.com/rust-osdev/cargo-xbuild/pull/91) <span class="gray">(published as `v0.6.1`)</span>