Update GPU regions availability (#1928)

Author: dangra

gpus/getting-started-gpus.html.md

@@ -48,7 +48,7 @@ Currently GPUs are available in the following regions:
 - `a10`: `ord`
 - `l40s`: `ord`
 - `a100-40gb`: `ord`
-- `a100-80gb`: `ams`, `iad`, `mia`, `sjc`, `syd`
+- `a100-80gb`: `iad`, `sjc`, `syd`
 
 
 ### Change GPU model

gpus/gpu-quickstart.html.markerb

@@ -23,7 +23,7 @@ nav: firecracker
     - `a10`: `ord`
     - `l40s`: `ord`
     - `a100-40gb`: `ord`
-    - `a100-80gb`: `ams`, `iad`, `mia`, `sjc`, `syd`
+    - `a100-80gb`: `iad`, `sjc`, `syd`
     </div>
 
 1. Create or modify the `fly.toml` config file in the project source directory, replacing values with your own:

gpus/index.html.md

@@ -33,7 +33,7 @@ Currently GPUs are available in the following regions:
 - `a10`: `ord`
 - `l40s`: `ord`
 - `a100-40gb`: `ord`
-- `a100-80gb`: `ams`, `iad`, `mia`, `sjc`, `syd`
+- `a100-80gb`: `iad`, `sjc`, `syd`
 
 ## Examples