DOC-815 Fix install commands (#887)

Author: Deflaimun

modules/get-started/partials/install-rpk-linux.adoc

@@ -19,7 +19,7 @@ arm64::
 curl -LO https://github.com/redpanda-data/redpanda/releases/latest/download/rpk-linux-arm64.zip &&
   mkdir -p ~/.local/bin &&
   export PATH="~/.local/bin:$PATH" &&
-  unzip rpk-linux-amd64.zip -d ~/.local/bin/
+  unzip rpk-linux-arm64.zip -d ~/.local/bin/
 ----
 ====
 // end::latest[]
@@ -45,7 +45,7 @@ arm64::
 curl -LO https://github.com/redpanda-data/redpanda/releases/download/v<version>/rpk-linux-arm64.zip &&
   mkdir -p ~/.local/bin &&
   export PATH="~/.local/bin:$PATH" &&
-  unzip rpk-linux-amd64.zip -d ~/.local/bin/
+  unzip rpk-linux-arm64.zip -d ~/.local/bin/
 ----
 ====
 endif::[]