Improve README files (#9760)

This PR makes it easier for first-time builders to just copy-and-paste
and fix typos.

Relates to
paritytech/polkadot-sdk-minimal-template#25

Author: raymondkfcheung

templates/minimal/README.md

@@ -145,5 +145,5 @@ the Polkadot SDK documentation resources.
 
 - 👥 Additionally, there are [GitHub issues](https://github.com/paritytech/polkadot-sdk/issues) and
 [Substrate StackExchange](https://substrate.stackexchange.com/).
-- 👥You can also reach out on the [Official Polkdot discord server](https://polkadot-discord.w3f.tools/)
+- 👥You can also reach out on the [Official Polkadot discord server](https://polkadot-discord.w3f.tools/)
 - 🧑Reach out on [Telegram](https://t.me/substratedevs) for more questions and discussions

templates/parachain/README.docify.md

@@ -87,7 +87,11 @@ be used to run the parachain template's runtime. `polkadot-omni-node` binary cra
 
 #### Install `polkadot-omni-node`
 
-Please see the installation section at [`crates.io/omni-node`](https://crates.io/crates/polkadot-omni-node).
+```sh
+cargo install polkadot-omni-node
+```
+
+> For more advanced options, please see the installation section at [`crates.io/omni-node`](https://crates.io/crates/polkadot-omni-node).
 
 #### Build `parachain-template-runtime`
 
@@ -97,7 +101,11 @@ cargo build --profile production
 
 #### Install `staging-chain-spec-builder`
 
-Please see the installation section at [`crates.io/staging-chain-spec-builder`](https://crates.io/crates/staging-chain-spec-builder).
+```sh
+cargo install staging-chain-spec-builder
+```
+
+> For more advanced options, please see the installation section at [`crates.io/staging-chain-spec-builder`](https://crates.io/crates/staging-chain-spec-builder).
 
 #### Use `chain-spec-builder` to generate the `chain_spec.json` file
 
@@ -256,5 +264,5 @@ relay chain network (see [Parachain Template node](#parachain-template-node) set
 
 - 👥 Additionally, there are [GitHub issues](https://github.com/paritytech/polkadot-sdk/issues) and
   [Substrate StackExchange](https://substrate.stackexchange.com/).
-- 👥You can also reach out on the [Official Polkdot discord server](https://polkadot-discord.w3f.tools/)
+- 👥You can also reach out on the [Official Polkadot discord server](https://polkadot-discord.w3f.tools/)
 - 🧑Reach out on [Telegram](https://t.me/substratedevs) for more questions and discussions

templates/parachain/README.md

@@ -89,7 +89,11 @@ be used to run the parachain template's runtime. `polkadot-omni-node` binary cra
 
 #### Install `polkadot-omni-node`
 
-Please see the installation section at [`crates.io/omni-node`](https://crates.io/crates/polkadot-omni-node).
+```sh
+cargo install polkadot-omni-node
+```
+
+> For more advanced options, please see the installation section at [`crates.io/omni-node`](https://crates.io/crates/polkadot-omni-node).
 
 #### Build `parachain-template-runtime`
 
@@ -99,7 +103,11 @@ cargo build --profile production
 
 #### Install `staging-chain-spec-builder`
 
-Please see the installation section at [`crates.io/staging-chain-spec-builder`](https://crates.io/crates/staging-chain-spec-builder).
+```sh
+cargo install staging-chain-spec-builder
+```
+
+> For more advanced options, please see the installation section at [`crates.io/staging-chain-spec-builder`](https://crates.io/crates/staging-chain-spec-builder).
 
 #### Use `chain-spec-builder` to generate the `chain_spec.json` file
 
@@ -258,5 +266,5 @@ relay chain network (see [Parachain Template node](#parachain-template-node) set
 
 - 👥 Additionally, there are [GitHub issues](https://github.com/paritytech/polkadot-sdk/issues) and
   [Substrate StackExchange](https://substrate.stackexchange.com/).
-- 👥You can also reach out on the [Official Polkdot discord server](https://polkadot-discord.w3f.tools/)
+- 👥You can also reach out on the [Official Polkadot discord server](https://polkadot-discord.w3f.tools/)
 - 🧑Reach out on [Telegram](https://t.me/substratedevs) for more questions and discussions