chore(docs): replace NEXT version placeholders with target SDK versions

- Go: 0.18.0 (opentdf/platform#3410)
- Java: 0.15.0 (opentdf/java-sdk#358)
- JS: 0.17.0 (opentdf/web-sdk#929)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: marythought

code_samples/policy_code/create_attribute.mdx

@@ -46,7 +46,7 @@ await platform.v1.attributes.createAttribute({ ... })
 <Tabs>
 <TabItem value="go" label="Go">
 
-<SdkVersion language="go" version="NEXT" source="opentdf" />
+<SdkVersion language="go" version="0.18.0" source="opentdf" />
 
 ```go
 import (
@@ -72,7 +72,7 @@ log.Printf("Created attribute: %s (ID: %s)\n",
 </TabItem>
 <TabItem value="java" label="Java">
 
-<SdkVersion language="java" version="NEXT" source="opentdf" />
+<SdkVersion language="java" version="0.15.0" source="opentdf" />
 
 import CreateAttributeExample from '@site/code_samples/java/create-attribute.mdx';
 
@@ -81,7 +81,7 @@ import CreateAttributeExample from '@site/code_samples/java/create-attribute.mdx
 </TabItem>
 <TabItem value="js" label="JavaScript">
 
-<SdkVersion language="js" version="NEXT" source="opentdf" />
+<SdkVersion language="js" version="0.17.0" source="opentdf" />
 
 ```typescript
 import { AttributeRuleTypeEnum } from '@opentdf/sdk';

code_samples/policy_code/create_subject_condition_set.mdx

@@ -43,7 +43,7 @@ await platform.v1.subjectMapping.createSubjectConditionSet({ ... })
 <Tabs>
 <TabItem value="go" label="Go">
 
-<SdkVersion language="go" version="NEXT" source="opentdf" />
+<SdkVersion language="go" version="0.18.0" source="opentdf" />
 
 ```go
 import (
@@ -86,7 +86,7 @@ log.Printf("Created Subject Condition Set with ID: %s\n", resp.GetSubjectConditi
 </TabItem>
 <TabItem value="java" label="Java">
 
-<SdkVersion language="java" version="NEXT" source="opentdf" />
+<SdkVersion language="java" version="0.15.0" source="opentdf" />
 
 import CreateSubjectConditionSetExample from '@site/code_samples/java/create-subject-condition-set.mdx';
 
@@ -95,7 +95,7 @@ import CreateSubjectConditionSetExample from '@site/code_samples/java/create-sub
 </TabItem>
 <TabItem value="js" label="JavaScript">
 
-<SdkVersion language="js" version="NEXT" source="opentdf" />
+<SdkVersion language="js" version="0.17.0" source="opentdf" />
 
 ```typescript
 import { create } from '@bufbuild/protobuf';