fix: typo in a Map description

spec.md

@@ -270,7 +270,7 @@ Field Name  |  Type  | Description
 <a name="link-description"></a>description  | `string` | A description of the link. [GitHub Flavored Markdown syntax](https://github.github.com/gfm/) MAY be used for rich text representation.
 <a name="link-summary"></a>summary | `string` | Short description for the link.
 <a name="link-method"></a>method | `string` | The name of an _existing_, resolvable OpenRPC method, as defined with a unique `method`. This field MUST resolve to a unique [Method Object](#method-object). As opposed to Open Api, Relative `method` values  ARE NOT permitted.
-<a name="link-parameters"></a>params   | Map[`string`, `Any` \| [Runtime Expression](#runtime-expression)]] | A map representing parameters to pass to a method as specified with `method`. The key is the parameter name to be used, whereas the value can be a constant or a [runtime expression](#runtime-expression) to be evaluated and passed to the linked method.
+<a name="link-parameters"></a>params   | Map[`string`, `Any` \| [Runtime Expression](#runtime-expression)] | A map representing parameters to pass to a method as specified with `method`. The key is the parameter name to be used, whereas the value can be a constant or a [runtime expression](#runtime-expression) to be evaluated and passed to the linked method.
 <a name="link-server"></a>server | [Server Object](#server-object) | A server object to be used by the target method.
 
 A linked method must be identified directly, and must exist in the list of methods defined by the [Methods Object](#method-object).