docs: Fixed numbering in quick_start.md (#777)

Signed-off-by: Mark Stickley <markstickley@users.noreply.github.com>

docs/quick_start.md

@@ -78,7 +78,7 @@ spec:
 EOF
 ```
 
-#### 5. Install a source definition
+#### 6. Install a source definition
 
 This is added as a custom resource of kind `FeatureFlagSource` in `flags` namespace
 
@@ -96,7 +96,7 @@ spec:
 EOF
 ```
 
-#### 6. Deploy sample workload 
+#### 7. Deploy sample workload 
 
 Workload is deployed to namespace `workload`
 
@@ -137,7 +137,7 @@ spec:
 EOF
 ```
 
-#### 7. Validate deployment & flag evaluation
+#### 8. Validate deployment & flag evaluation
 
 First, obtain the pod name of the workload,