Fix minor tutorial docs mistakes

tutorial/01_your_first_workflow/README.md

@@ -58,7 +58,7 @@ That's it! Everything happens inside the `execute do ... end` block.
 
 ## Your First Chat Cog
 
-The `chat` cog sends a prompt to a cloud-based LLM and gets a response back. Here's a simplest example:
+The `chat` cog sends a prompt to a cloud-based LLM and gets a response back. Here's a simple example:
 
 ```ruby
 execute do

tutorial/02_chaining_cogs/README.md

@@ -42,11 +42,11 @@ end
 ```
 
 This returns the cog's output, or `nil` if the cog didn't run (we'll learn about conditionally skipping steps in a later
-lesson.
+lesson).
 
 ### Different Output Methods
 
-Different cog types provide different types of output. Here are few highlights:
+Different cog types provide different types of output. Here are a few highlights:
 
 - `chat(:name).response` - The text response from a chat cog
 - `agent(:name).response` - The text response from an agent cog

tutorial/03_targets_and_params/README.md

@@ -177,7 +177,7 @@ execute do
   agent(:process) do
     files = targets.join("\n")
     format = kwarg(:format) || "detailed"
-    "Process these files and provide a #{format} report:\n#{files}) "
+    "Process these files and provide a #{format} report:\n#{files} "
   end
 
   cmd(:grep_pattern) do

tutorial/08_iterative_workflows/README.md

@@ -89,7 +89,7 @@ execute(:process_numbers) do
   ruby(:check) do |_, _, index|
     # Skip processing for multiples of 3
     if index % 3 == 0
-      puts "  Skipping every third 3 iteration"
+      puts "  Skipping every third iteration"
       next!
     end
     puts "Processing #{index}"