CTR small fixes to mcp reference doc and upgrade docs

Author: xiazcy

docs/src/reference/gremlin-applications.asciidoc

@@ -3014,7 +3014,7 @@ describeGraph(HadoopGraph)
 ----
 
 [[gremlin-mcp]]
-=== Gremlin MCP
+== Gremlin MCP
 
 Gremlin MCP integrates Apache TinkerPop with the Model Context Protocol (MCP) so that MCP‑capable assistants (for
 example, desktop chat clients that support MCP) can discover your graph, run Gremlin traversals and exchange graph data
@@ -3058,7 +3058,7 @@ The Gremlin MCP server exposes these tools:
 * `refresh_schema_cache` — Forces schema discovery to run again when the graph has changed.
 * `format_gremlin_query` — Formats a Gremlin query using gremlint.
 
-==== Schema discovery
+=== Schema discovery
 
 Schema discovery is the foundation that lets humans and AI assistants reason about a graph without prior tribal
 knowledge. By automatically mapping the graph’s structure and commonly observed patterns, it produces a concise,
@@ -3078,7 +3078,7 @@ Schema discovery uses Gremlin traversals and sampling to uncover the following i
 * Relationship patterns - Connectivity is derived from the labels of edges and their incident vertices.
 * Enums - Properties with a small set of distinct values may be surfaced as enumerations to promote precise filters.
 
-==== Formatting traversals
+=== Formatting traversals
 
 Gremlin is much easier to understand when it is properly formatted with appropriate line breaks and indents. An AI
 assistant can format Gremlin using Gremlint via `format_gremlin_query` MCP tool which accepts any string input and
@@ -3113,7 +3113,7 @@ g.V().
         limit(1).fold())
 ----
 
-==== Executing traversals
+=== Executing traversals
 
 When the assistant needs to answer a question, a common sequence is:
 
@@ -3130,7 +3130,7 @@ For example, the assistant may execute a traversal like the following:
 g.V().hasLabel('person').has('age', gt(30)).out('knows').values('name')
 ----
 
-==== Configuring an MCP Client
+=== Configuring an MCP Client
 
 The MCP client is responsible for launching the Gremlin MCP server and providing connection details for the Gremlin
 endpoint the server should use.

docs/src/upgrade/release-3.8.1.asciidoc

@@ -132,5 +132,13 @@ intervention.
 
 ==== Graph System Providers
 
+===== New Gherkin Test Tags
+
+New Gherkin test tags have been added for scenarios that require the graph to support specific property value types:
+`@AllowDateTimePropertyValues`, `@AllowListPropertyValues`, `@AllowMapPropertyValues`, `@AllowSetPropertyValues`, and
+`@AllowUUIDPropertyValues`. Providers whose graphs do not support storing these types as property values should exclude
+the relevant tags in their `@CucumberOptions`. The full list of tags can be found
+link:https://tinkerpop.apache.org/docs/3.8.1/dev/developer/#gherkin-tags[here].
+
 ==== Graph Driver Providers