Tweak fiber dynamic bindings doc

content/docs/fibers/dynamic_bindings.mdz

@@ -5,7 +5,7 @@
 There are situations where the programmer would like to thread a parameter
 through multiple function calls, without passing that argument to every function
 explicitly.  This can make code more concise, easier to read, and easier to
-extend. Dynamic bindings are a mechanism that provide this in a safe and easy to
+extend. Dynamic bindings are a mechanism that provides this in a safe and easy to
 use way.  This is in contrast to lexically-scoped bindings, which are usually
 superior to dynamically-scoped bindings in terms of clarity, composability, and
 performance. However, dynamic scoping can be used to great effect for implicit
@@ -54,38 +54,39 @@ print function @code`pp`.
 (def curr-env (fiber/getenv (fiber/current)))
 
 # The dynamic bindings we want to use
-(def my-env {:pretty-format "Inside myblock: %.20P"})
+(def my-env @{:pretty-format "Inside myblock: %.20P"})
 
 # Set up a new fiber
 (def f (fiber/new myblock))
 (fiber/setenv f (table/setproto my-env curr-env))
 
 # Run the code
-(pp [1 2 3]) # prints "[1 2 3]"
-(resume f) # prints "Inside myblock: [1 2 3]"
-(pp [1 2 3]) # prints "[1 2 3]"
+(pp [1 2 3]) # prints "(1 2 3)"
+(resume f) # prints "Inside myblock: (1 2 3)"
+(pp [1 2 3]) # prints "(1 2 3)"
 ```
 
 This is verbose so the core library provides a macro, @code`with-dyns`, that
 makes it much clearer in the common case.
 
 @codeblock[janet]```
-(pp [1 2 3]) # prints "[1 2 3]"
-# prints "Inside with-dyns: [1 2 3]"
+(pp [1 2 3]) # prints "(1 2 3)"
+# prints "Inside with-dyns: (1 2 3)"
 (with-dyns [:pretty-format "Inside with-dyns: %.20P"]
   (pp [1 2 3]))
-(pp [1 2 3]) # prints "[1 2 3]"
+(pp [1 2 3]) # prints "(1 2 3)"
 ```
 
 ## When to use dynamic bindings
 
-Dynamic bindings should be used when you want to pass around an implicit, global
-context, especially when you want to automatically reset the context if an error
-is raised. Since a dynamic binding is tied to the current fiber, when a fiber
-exits the context is automatically unset. This is much easier and often more
-efficient than manually trying to detect errors and unset context. Consider the
-following example code, written once with a global var and once with a dynamic
-binding.
+Dynamic bindings should be used when you want to pass around an
+implicit, global context, especially when you want to automatically
+reset the context if an error is raised. Since a dynamic binding is
+tied to the current fiber, when a fiber exits the context is
+automatically unset. This is much easier and often more efficient than
+manually trying to detect errors and unset the context. Consider the
+following example code, written once with a global var and once with a
+dynamic binding.
 
 ### Using a global var