perplexity: Remove duplicate step and fix numbering in README (#17978)

Graham Taylor and Marshall Bowers created

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

Change summary

extensions/perplexity/README.md | 38 ++++++++++++++++++----------------
1 file changed, 20 insertions(+), 18 deletions(-)

Detailed changes

extensions/perplexity/README.md 🔗

@@ -12,30 +12,32 @@ Open the AI Assistant panel (`cmd-r` or `ctrl-r`) and enter:
 
 ## Development Setup
 
-1. Install the rust toolchain and clone the zed repo:
-```
-curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+1. Install the Rust toolchain and clone the zed repo:
 
-mkdir -p ~/code
-cd ~/code
-git clone https://github.com/zed-industries/zed
-```
+   ```
+   curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
 
-2. Launch Zed and Open Zed Extensions (`cmd-shift-x` / `ctrl-shift-x`)
-3. Open Zed
-4. Open Zed Extensions (`cmd-shift-x` / `ctrl-shift-x`)
-5. Click "Install Dev Extension"
-6. Navigate to the "extensions/perplexity" folder inside the zed git repo.
-7. Ensure your `PERPLEXITY_API_KEY` environment variable is set (instructions below)
-```sh
-env |grep PERPLEXITY_API_KEY
-```
-8. Quit and relaunch Zed
+   mkdir -p ~/code
+   cd ~/code
+   git clone https://github.com/zed-industries/zed
+   ```
+
+1. Open Zed
+1. Open Zed Extensions (`cmd-shift-x` / `ctrl-shift-x`)
+1. Click "Install Dev Extension"
+1. Navigate to the "extensions/perplexity" folder inside the zed git repo.
+1. Ensure your `PERPLEXITY_API_KEY` environment variable is set (instructions below)
+
+   ```sh
+   env | grep PERPLEXITY_API_KEY
+   ```
+
+1. Quit and relaunch Zed
 
 ## PERPLEXITY_API_KEY
 
 This extension requires a Perplexity API key to be available via the `PERPLEXITY_API_KEY` environment variable.
 
-To onbtain a Perplexity.ai API token, login to your Perplexity.ai account and go [Settings->API](https://www.perplexity.ai/settings/api) and under "API Keys" click "Generate".  This will require you to have [Perplexity Pro](https://www.perplexity.ai/pro) or to buy API credits. By default the extension uses `llama-3.1-sonar-small-128k-online`, currently cheapest model available which is roughly half a penny per request + a penny per 50,000 tokens.  So most requests will cost less than $0.01 USD.
+To onbtain a Perplexity.ai API token, login to your Perplexity.ai account and go [Settings->API](https://www.perplexity.ai/settings/api) and under "API Keys" click "Generate". This will require you to have [Perplexity Pro](https://www.perplexity.ai/pro) or to buy API credits. By default the extension uses `llama-3.1-sonar-small-128k-online`, currently cheapest model available which is roughly half a penny per request + a penny per 50,000 tokens. So most requests will cost less than $0.01 USD.
 
 Take your API key and add it to your environment by adding `export PERPLEXITY_API_KEY="pplx-0123456789abcdef..."` to your `~/.zshrc` or `~/.bashrc`. Reload close and reopen your terminal session. Check with `env |grep PERPLEXITY_API_KEY`.