doc updates (#1639)

---------

Co-authored-by: vbarda <vadym@langchain.dev>

docs/docs/cloud/how-tos/enqueue_concurrent.md

@@ -1,9 +1,10 @@
-## Enqueue
+# Enqueue
 
 This guide assumes knowledge of what double-texting is, which you can learn about in the [double-texting conceptual guide](../concepts/api.md#double-texting).
 
 The guide covers the `enqueue` option for double texting, which adds the interruptions to a queue and executes them in the order they are received by the client. Below is a quick example of using the `enqueue` option.
 
+## Setup
 
 First, we will define a quick helper function for printing out JS and CURL model outputs (you can skip this if using Python):
 
@@ -82,6 +83,8 @@ Then, let's import our required packages and instantiate our client, assistant,
       --data '{}'
     ```
 
+## Create runs
+
 Now let's start two runs, with the second interrupting the first one with a multitask strategy of "enqueue":
 
 === "Python"
@@ -90,12 +93,12 @@ Now let's start two runs, with the second interrupting the first one with a mult
     first_run = await client.runs.create(
         thread["thread_id"],
         assistant_id,
-        input={"messages": [{"role": "human", "content": "what's the weather in sf?"}]},
+        input={"messages": [{"role": "user", "content": "what's the weather in sf?"}]},
     )
     second_run = await client.runs.create(
         thread["thread_id"],
         assistant_id,
-        input={"messages": [{"role": "human", "content": "what's the weather in nyc?"}]},
+        input={"messages": [{"role": "user", "content": "what's the weather in nyc?"}]},
         multitask_strategy="enqueue",
     )
     ```
@@ -106,13 +109,13 @@ Now let's start two runs, with the second interrupting the first one with a mult
     const firstRun = await client.runs.create(
       thread["thread_id"],
       assistantId,
-      input={"messages": [{"role": "human", "content": "what's the weather in sf?"}]},
+      input={"messages": [{"role": "user", "content": "what's the weather in sf?"}]},
     )
 
     const secondRun = await client.runs.create(
       thread["thread_id"],
       assistantId,
-      input={"messages": [{"role": "human", "content": "what's the weather in nyc?"}]},
+      input={"messages": [{"role": "user", "content": "what's the weather in nyc?"}]},
       multitask_strategy="enqueue",
     )
     ```
@@ -136,6 +139,8 @@ Now let's start two runs, with the second interrupting the first one with a mult
     }"
     ```
 
+## View run results
+
 Verify that the thread has data from both runs:
 
 === "Python"