CLIENT-SPECIFICATION: remove redirect indicators, use autolinks

Autolinks are part of the CommonMark spec (ref <https://spec.commonmark.org/0.30/#autolinks>) and well supported.

Redirect indicators are removed as a part of #12048.

CLIENT-SPECIFICATION.md

@@ -213,7 +213,7 @@ Step | Path checked | Outcome
 
 ## Caching
 
-If appropriate, it is RECOMMENDED that clients implement a cache of pages. If implemented, clients MUST download the entire archive either as a whole from **[https://tldr.sh/assets/tldr.zip](https://tldr.sh/assets/tldr.zip)** (Which redirects to [https://raw.githubusercontent.com/tldr-pages/tldr-pages.github.io/main/assets/tldr.zip](https://raw.githubusercontent.com/tldr-pages/tldr-pages.github.io/main/assets/tldr.zip)) or download language-specific translation archives in the format `https://tldr.sh/assets/tldr-pages.{{language-code}}.zip` (Which redirects to [https://raw.githubusercontent.com/tldr-pages/tldr-pages.github.io/main/assets/tldr-pages.{{language-code}}.zip](https://raw.githubusercontent.com/tldr-pages/tldr-pages.github.io/main/assets)), along with the archive for English from **[https://tldr.sh/assets/tldr-pages.zip](https://tldr.sh/assets/tldr-pages.zip)** (It redirects to [https://raw.githubusercontent.com/tldr-pages/tldr-pages.github.io/main/assets/tldr-pages.zip](https://raw.githubusercontent.com/tldr-pages/tldr-pages.github.io/main/assets/tldr-pages.zip)).
+If appropriate, it is RECOMMENDED that clients implement a cache of pages. If implemented, clients MUST download the entire archive either as a whole from **<https://tldr.sh/assets/tldr.zip>** or download language-specific translation archives in the format `https://tldr.sh/assets/tldr-pages.{{language-code}}.zip`, along with the archive for English from **<https://tldr.sh/assets/tldr-pages.zip>**.
 
 Caching SHOULD be done according to the user's language configuration (if any), to not waste unneeded space for unused languages. Additionally, clients MAY automatically update the cache regularly.