Make target maintainers more easily pingable

Put them all on the same line with just their GitHub handles to make it
very easy to copy and paste (with ctrl-shift-v!!!) the names.

We have no use for email, so I removed all the emails, we don't care
about people's full names either.

Co-authored-by: Thalia Archibald <thalia@archibald.dev>

Author: Noratrieb

src/doc/rustc/src/platform-support/TEMPLATE.md

@@ -6,7 +6,8 @@ One-sentence description of the target (e.g. CPU, OS)
 
 ## Target maintainers
 
-- Some Person, https://github.com/...
+[@Ghost](https://github.com/Ghost)
+[@octocat](https://github.com/octocat)
 
 ## Requirements
 

src/doc/rustc/src/platform-support/aarch64-nintendo-switch-freestanding.md

@@ -4,10 +4,10 @@
 
 Nintendo Switch with pure-Rust toolchain.
 
-## Designated Developers
+## Target Maintainers
 
-* [@leo60228](https://github.com/leo60228)
-* [@jam1garner](https://github.com/jam1garner)
+[@leo60228](https://github.com/leo60228)
+[@jam1garner](https://github.com/jam1garner)
 
 ## Requirements
 

src/doc/rustc/src/platform-support/aarch64-unknown-teeos.md

@@ -20,8 +20,8 @@ TEEOS is open source in progress. [MORE about](https://gitee.com/opentrustee-gro
 
 ## Target maintainers
 
-- Petrochenkov Vadim
-- Sword-Destiny
+[@petrochenkov](https://github.com/petrochenkov)
+[@Sword-Destiny](https://github.com/Sword-Destiny)
 
 ## Setup
 We use OpenHarmony SDK for TEEOS.

src/doc/rustc/src/platform-support/aix.md

@@ -6,8 +6,8 @@ Rust for AIX operating system, currently only 64-bit PowerPC is supported.
 
 ## Target maintainers
 
-- David Tenty `daltenty@ibm.com`, https://github.com/daltenty
-- Chris Cambly, `ccambly@ca.ibm.com`, https://github.com/gilamn5tr
+[@daltenty](https://github.com/daltenty)
+[@gilamn5tr](https://github.com/gilamn5tr)
 
 ## Requirements
 

src/doc/rustc/src/platform-support/amdgcn-amd-amdhsa.md

@@ -6,7 +6,7 @@ AMD GPU target for compute/HSA (Heterogeneous System Architecture).
 
 ## Target maintainers
 
-- [@Flakebi](https://github.com/Flakebi)
+[@Flakebi](https://github.com/Flakebi)
 
 ## Requirements
 

src/doc/rustc/src/platform-support/android.md

@@ -8,9 +8,9 @@
 
 ## Target maintainers
 
-- Chris Wailes ([@chriswailes](https://github.com/chriswailes))
-- Matthew Maurer ([@maurer](https://github.com/maurer))
-- Martin Geisler ([@mgeisler](https://github.com/mgeisler))
+[@chriswailes](https://github.com/chriswailes)
+[@maurer](https://github.com/maurer)
+[@mgeisler](https://github.com/mgeisler)
 
 ## Requirements
 

src/doc/rustc/src/platform-support/apple-darwin.md

@@ -9,8 +9,8 @@ Apple macOS targets.
 
 ## Target maintainers
 
-- [@thomcc](https://github.com/thomcc)
-- [@madsmtm](https://github.com/madsmtm)
+[@thomcc](https://github.com/thomcc)
+[@madsmtm](https://github.com/madsmtm)
 
 ## Requirements
 

src/doc/rustc/src/platform-support/apple-ios-macabi.md

@@ -9,9 +9,9 @@ Apple Mac Catalyst targets.
 
 ## Target maintainers
 
-- [@badboy](https://github.com/badboy)
-- [@BlackHoleFox](https://github.com/BlackHoleFox)
-- [@madsmtm](https://github.com/madsmtm)
+[@badboy](https://github.com/badboy)
+[@BlackHoleFox](https://github.com/BlackHoleFox)
+[@madsmtm](https://github.com/madsmtm)
 
 ## Requirements
 

src/doc/rustc/src/platform-support/apple-ios.md

@@ -15,9 +15,9 @@ Apple iOS / iPadOS targets.
 
 ## Target maintainers
 
-- [@badboy](https://github.com/badboy)
-- [@deg4uss3r](https://github.com/deg4uss3r)
-- [@madsmtm](https://github.com/madsmtm)
+[@badboy](https://github.com/badboy)
+[@deg4uss3r](https://github.com/deg4uss3r)
+[@madsmtm](https://github.com/madsmtm)
 
 ## Requirements
 

src/doc/rustc/src/platform-support/apple-tvos.md

@@ -10,8 +10,8 @@ Apple tvOS targets.
 
 ## Target maintainers
 
-- [@thomcc](https://github.com/thomcc)
-- [@madsmtm](https://github.com/madsmtm)
+[@thomcc](https://github.com/thomcc)
+[@madsmtm](https://github.com/madsmtm)
 
 ## Requirements