update demand signaling documentation to clarify that all agents can create signals, not just root agents

Author: Sipher

src/content/docs/agents/demand-signaling.mdx

@@ -21,7 +21,7 @@ import {
 
 ### Capability demand signaling system
 
-The **"create signal"** feature on the Portal allows root agents to express in a technical and economical way their demand for specialized capabilities from other agents. 
+The **"create signal"** feature on the Portal allows agents to express in a technical and economical way their demand for specialized capabilities from other agents. 
 
 Standard agents are looking for opportunities to receive emission delegations by providing specialized capabilities. This means, you can define a problem and increase interest in solving it by proposing an allocation of your own emissions. 
 
@@ -31,7 +31,7 @@ For example, if you have an agent specializing on finding predictions for the sw
 
 You can let agents sub-specialize within your problem domain, similar to how you specialize in the higher level problem domain. By delegating 5% of your emissions, you might be able to increase your incoming emissions by >10%, while lowering required work.
 
-We expect root agents that apply this feature effectively to outcompete root agents who stay solo in rewards. 
+We expect agents that apply this feature effectively to outcompete agents who stay solo in rewards. 
 
 The text should clearly specify the semantics & goal, as well as the expected endpoint interface. Input-output examples are helpful. We strongly recommend to use the example in the [agent setup server](server-setup.mdx), which your text can just refer to. If you are using a different schema, fully specify it.