docs(solana): clarify on what to do with OFT programId (#1068)

examples/oft-solana/README.md

@@ -13,7 +13,7 @@
 ## Setup
 
 We recommend using `pnpm` as a package manager (but you can of course use a package manager of your choice).
-Additionally, we highly recommend that you use the most up-to-date Docker version to avoid any issues with anchor
+Docker is required to build using anchor. We highly recommend that you use the most up-to-date Docker version to avoid any issues with anchor
 builds.
 
 ### Get the code
@@ -49,10 +49,28 @@ anchor keys sync
 
 :warning: `--force` flag overwrites the existing keys with the ones you generate.
 
-:warning: Ensure that [lib.rs](./programs/oft/src/lib.rs) has the updated programId.
+Run `anchor keys list` to view the generated programIds (public keys). The output should look something like this:
+
+```
+endpoint: <ENDPOINT_PROGRAM_ID>
+oft: <OFT_PROGRAM_ID>
+```
+
+Copy the OFT's programId and go into [lib.rs](./programs/oft/src/lib.rs). Note the following snippet:
+
+```
+declare_id!(Pubkey::new_from_array(program_id_from_env!(
+    "OFT_ID",
+    "9UovNrJD8pQyBLheeHNayuG1wJSEAoxkmM14vw5gcsTT"
+)));
+```
+
+Replace `9UovNrJD8pQyBLheeHNayuG1wJSEAoxkmM14vw5gcsTT` with the programId that you have copied.
 
 ### Building and Deploying the OFT Program
 
+Ensure you have Docker running before running the build command.
+
 ```bash
 anchor build -v # verification flag enabled
 solana program deploy --program-id target/deploy/oft-keypair.json target/verifiable/oft.so -u mainnet-beta