Fix CLI info regarding Springboot quickstart (#5849)

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**What type of PR is this:**

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/kind documentation

**What does this PR do / why we need it:**

An incorrect rebase messed up the quickstart guide, as well as feedback
from users reccomended to remove the CLI portion of the springboot
guide.

**Which issue(s) this PR fixes:**
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**PR acceptance criteria:**

- [X] Documentation

**How to test changes / Special notes to the reviewer:**

Signed-off-by: Charlie Drage <[email protected]>

docs/website/versioned_docs/version-3.0.0/user-guides/quickstart.md

@@ -104,11 +104,6 @@ Restore succeeded.
 
   <TabItem value="java" label="Java (Spring Boot)">
 
-You can generate your code with either the:
-* Spring web interface
-* `spring` CLI
-
-**Generating a project through the Spring web interface:**
 For Java, we will use the [Spring Initializr](https://start.spring.io/) to generate the example source code:
 
 1. Navigate to [start.spring.io](https://start.spring.io/) 
@@ -117,21 +112,6 @@ For Java, we will use the [Spring Initializr](https://start.spring.io/) to gener
 4. Select "Spring Web"
 5. Click "Generate" to generate and download the source code
 
-Finally, open a terminal and navigate to the directory.
-
-**Generating a project through the `spring` CLI:**
-
-```console
-$ spring init --dependencies=web --build=maven --language=java --java-version=11 my-springboot-project
-Using service at https://start.spring.io
-Project extracted to '/Users/user/my-springboot-project'
-```
-
-=======
-2. Click on "Add" under "Dependencies"
-3. Select "Spring Web"
-4. Click "Generate" to generate and download the source code
-
 Finally, open a terminal and navigate to the directory.
 
   </TabItem>