Fix MDX syntax, broken links, and use of updated variables (#159)

* fix mdx syntax and links

* fix duplicate Elastic

Author: colleenmcginnis

serverless/pages/welcome-to-serverless.mdx

@@ -7,15 +7,15 @@ layout: landing
 
 # Elastic Cloud Serverless <DocBadge template="technical preview" />
 
-Elastic Cloud Serverless products allow you to deploy and use Elastic for your use cases without managing the underlying Elastic cluster, 
-such as nodes, data tiers, and scaling. Serverless instances are fully-managed, autoscaled, and automatically upgraded by Elastic so you can 
-focus more on gaining value and insight from your data. 
+Elastic Cloud Serverless products allow you to deploy and use Elastic for your use cases without managing the underlying Elastic cluster,
+such as nodes, data tiers, and scaling. Serverless instances are fully-managed, autoscaled, and automatically upgraded by Elastic so you can
+focus more on gaining value and insight from your data.
 
 Elastic provides three serverless solutions available on ((ecloud)):
 
 - **((es))** &mdash; Build powerful applications and search experiences using a rich ecosystem of vector search capabilities, APIs, and libraries.
-- **Elastic ((observability))** &mdash; Monitor your own platforms and services using powerful machine learning and analytics tools with your logs, metrics, traces, and APM data.
-- **Elastic ((security))** &mdash; Detect, investigate, and respond to threats, with SIEM, endpoint protection, and AI-powered analytics capabilities.
+- **((observability))** &mdash; Monitor your own platforms and services using powerful machine learning and analytics tools with your logs, metrics, traces, and APM data.
+- **((security))** &mdash; Detect, investigate, and respond to threats, with SIEM, endpoint protection, and AI-powered analytics capabilities.
 
 Serverless instances of the Elastic Stack that you create in ((ecloud)) are called **serverless projects**.