Fix incorrect REST API endpoint URIs in documentation (#16311)

Corrected three REST API endpoint path errors:
- OIDC issuers: Changed /api/{organization}/ to /api/orgs/{organization}/
- Webhooks: Added missing 'stacks/' segment to stack webhook deletion endpoint
- Deployments: Fixed two endpoints using 'stack' instead of 'stacks'

These corrections ensure that users have the correct API paths for making requests.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <[email protected]>

Author: jkodroff

content/docs/reference/cloud-rest-api/deployments/_index.md

@@ -804,7 +804,7 @@ POST https://api.pulumi.com/api/orgs/{organization}/deployments/resume
 ```shell
 curl -i -XPOST -H "Content-Type: application/json" \
 -H "Authorization: token $PULUMI_ACCESS_TOKEN" \
---location "https://api.pulumi.com/api/stack/my-org/aws-ts-s3-folder/dev/deployments/resume"
+--location "https://api.pulumi.com/api/stacks/my-org/aws-ts-s3-folder/dev/deployments/resume"
 ```
 
 ## Get Deployments Metadata
@@ -834,7 +834,7 @@ GET https://api.pulumi.com/api/orgs/{organization}/deployments/metadata
 ```shell
 curl -XGET -H "Content-Type: application/json" \
 -H "Authorization: token $PULUMI_ACCESS_TOKEN" \
---location "https://api.pulumi.com/api/stack/my-org/aws-ts-s3-folder/dev/deployments/metadata"
+--location "https://api.pulumi.com/api/stacks/my-org/aws-ts-s3-folder/dev/deployments/metadata"
 ```
 
 #### Response

content/docs/reference/cloud-rest-api/oidc-issuers/_index.md

@@ -177,7 +177,7 @@ curl \
   -H "Accept: application/vnd.pulumi+8" \
   -H "Content-Type: application/json" \
   -H "Authorization: token $PULUMI_ACCESS_TOKEN" \
-  https://api.pulumi.com/api/{organization}/oidc/issuers
+  https://api.pulumi.com/api/orgs/{organization}/oidc/issuers
 ```
 
 ## Get the issuer's auth policies

content/docs/reference/cloud-rest-api/webhooks/_index.md

@@ -222,7 +222,7 @@ curl \
   -H "Content-Type: application/json" \
   -H "Authorization: token $PULUMI_ACCESS_TOKEN" \
   --request DELETE \
-  https://api.pulumi.com/api/{organization}/{project}/{stack}/hooks/{webhookname}
+  https://api.pulumi.com/api/stacks/{organization}/{project}/{stack}/hooks/{webhookname}
 ```
 
 ## Ping Webhook