s/tier 3/tier 2/

Author: japaric

newsletters/2018-03-29.md

@@ -186,7 +186,7 @@ We'll try to get it stabilized by the edition release but it's not a high priori
 
 We don't only want to make embedded Rust possible on stable; we also want to make sure the embedded targets don't regress. So we are going to add tests to rust-lang/rust CI to make sure regression block PRs from landing.
 
-That effectively will make some of the embedded targets into the tier 1 platform. The core team is fine with adding the `thumb*` targets (ARM Cortex-M) to tier 1. Less maintained, still in development and not fully mature targets like AVR, MSP430 and RISCV will become tier 3 -- they'll be tested but won't block PRs and rust-std binaries will be produced but it's not guaranteed there will be binaries available for all nightly / beta / stable releases.
+That effectively will make some of the embedded targets into the tier 1 platform. The core team is fine with adding the `thumb*` targets (ARM Cortex-M) to tier 1. Less maintained, still in development and not fully mature targets like AVR, MSP430 and RISCV will become tier 2 -- they'll be tested but won't block PRs and rust-std binaries will be produced but it's not guaranteed there will be binaries available for all nightly / beta / stable releases.
 
 We'll open an issue to discuss with the infra team the exact tests we want to add and track progress on that, but have already told them about the kind of tests we want to add and they thought those kind of tests are possible to implement. The kind of tests we discussed were:
 
@@ -215,4 +215,4 @@ Getting tooling for e.g. binary inspection (e.g. `objdump`) can be hard on some
 We decided on an initial audience for the embedded book; we will be targeting people that know some embedded stuff *and* some Rust. The main reason for this is that if someone knows one and not the
 other then they can go and read existing Rust documentation or the Discovery book and then read the embedded book. For more details check [rust-lang-nursery/embedded-wg#56].
 
-[rust-lang-nursery/embedded-wg#56]: https://github.com/rust-lang-nursery/embedded-wg/issues/56
+[rust-lang-nursery/embedded-wg#56]: https://github.com/rust-lang-nursery/embedded-wg/issues/56