docs: make AMISelectorTerm.Owner string (aws#7646)

Author: juliusmh

website/content/en/docs/concepts/nodeclasses.md

@@ -817,7 +817,7 @@ Select by name and owner:
     - name: my-ami
       owner: self
     - name: my-ami
-      owner: 0123456789
+      owner: "0123456789"
 ```
 
 Select by name using a wildcard:

website/content/en/preview/concepts/nodeclasses.md

@@ -817,7 +817,7 @@ Select by name and owner:
     - name: my-ami
       owner: self
     - name: my-ami
-      owner: 0123456789
+      owner: "0123456789"
 ```
 
 Select by name using a wildcard:

website/content/en/v0.32/concepts/nodeclasses.md

@@ -459,7 +459,7 @@ Select by name and owner:
     - name: my-ami
       owner: self
     - name: my-ami
-      owner: 0123456789
+      owner: "0123456789"
 ```
 
 Select by name using a wildcard:

website/content/en/v0.32/upgrading/v1beta1-migration.md

@@ -703,9 +703,9 @@ kind: EC2NodeClass
 spec:
   amiSelectorTerms:
   - name: my-name1
-    owner: 123456789
+    owner: "123456789"
   - name: my-name2
-    owner: 123456789
+    owner: "123456789"
   - name: my-name1
     owner: amazon
   - name: my-name2

website/content/en/v1.0/concepts/nodeclasses.md

@@ -818,7 +818,7 @@ Select by name and owner:
     - name: my-ami
       owner: self
     - name: my-ami
-      owner: 0123456789
+      owner: "0123456789"
 ```
 
 Select by name using a wildcard:

website/content/en/v1.1/concepts/nodeclasses.md

@@ -817,7 +817,7 @@ Select by name and owner:
     - name: my-ami
       owner: self
     - name: my-ami
-      owner: 0123456789
+      owner: "0123456789"
 ```
 
 Select by name using a wildcard:

website/content/en/v1.2/concepts/nodeclasses.md

@@ -817,7 +817,7 @@ Select by name and owner:
     - name: my-ami
       owner: self
     - name: my-ami
-      owner: 0123456789
+      owner: "0123456789"
 ```
 
 Select by name using a wildcard: