remove mentions of specific image hashes in docker commands

dapps/guides/docker.mdx

@@ -87,10 +87,6 @@ futurenet)
     ;;
 esac
 
-# this is set to the quickstart `soroban-dev` image anointed as the release
-# for a given Soroban Release, it is captured on Soroban Releases - https://soroban.stellar.org/docs/reference/releases
-QUICKSTART_SOROBAN_DOCKER_SHA=stellar/quickstart:testing@sha256:40636cdb1b9168b47e5dc120949fe3610ff914e8dd43409edb6fa66496bdd9c3
-
 shift
 
 # Run the soroban-preview container
@@ -126,7 +122,7 @@ docker run --rm -ti \
   --name stellar \
   --network soroban-network \
   -p 8000:8000 \
-  "$QUICKSTART_SOROBAN_DOCKER_SHA" \
+  stellar/quickstart:testing \
   $ARGS \
   --enable-soroban-rpc \
   "$@" # Pass through args from the CLI

docs/reference/rpc.mdx

@@ -33,13 +33,13 @@ It's also possible to run a contract in the local sandbox environment without a
 
 ### Standalone
 
-To run a local standalone network with the Stellar Quickstart Docker image, run the following command, double-checking that the `sha256` matches the latest on the [Releases](./releases.mdx) page:
+To run a local standalone network with the Stellar Quickstart Docker image, run the following command:
 
 ```bash
 docker run --rm -it \
     -p 8000:8000 \
     --name stellar \
-    stellar/quickstart:testing@sha256:1c98f895f8b69cc843eeaa5230d67044dbeb390a5529d51dd7762d8ff685c3f8 \
+    stellar/quickstart:testing \
     --standalone \
     --enable-soroban-rpc
 ```
@@ -112,7 +112,7 @@ Running your own Testnet node works much the same way as running a Quickstart no
 docker run --rm -it \
     -p 8000:8000 \
     --name stellar \
-    stellar/quickstart:testing@sha256:1c98f895f8b69cc843eeaa5230d67044dbeb390a5529d51dd7762d8ff685c3f8 \
+    stellar/quickstart:testing \
     --testnet \
     --enable-soroban-rpc
 ```