Set meta.description tag correctly

blog/content/second-edition/posts/02-minimal-rust-kernel/disable-red-zone/index.md

@@ -10,6 +10,8 @@ The [red zone] is an optimization of the [System V ABI] that allows functions to
 [red zone]: http://eli.thegreenplace.net/2011/09/06/stack-frame-layout-on-x86-64#the-red-zone
 [System V ABI]: http://wiki.osdev.org/System_V_ABI
 
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 ![stack frame with red zone](red-zone.svg)
 
 The image shows the stack frame of a function with `n` local variables. On function entry, the stack pointer is adjusted to make room on the stack for the return address and the local variables.

blog/content/second-edition/posts/02-minimal-rust-kernel/disable-simd/index.md

@@ -9,6 +9,8 @@ template = "second-edition/extra.html"
 
 [Single Instruction Multiple Data (SIMD)]: https://en.wikipedia.org/wiki/SIMD
 
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 - [MMX]: The _Multi Media Extension_ instruction set was introduced in 1997 and defines eight 64 bit registers called `mm0` through `mm7`. These registers are just aliases for the registers of the [x87 floating point unit].
 - [SSE]: The _Streaming SIMD Extensions_ instruction set was introduced in 1999. Instead of re-using the floating point registers, it adds a completely new register set. The sixteen new registers are called `xmm0` through `xmm15` and are 128 bits each.
 - [AVX]: The _Advanced Vector Extensions_ are extensions that further increase the size of the multimedia registers. The new registers are called `ymm0` through `ymm15` and are 256 bits each. They extend the `xmm` registers, so e.g. `xmm0` is the lower half of `ymm0`.