Fixed some small issues

Author: JDemler

src/doc/book/src/procedural-macros.md

@@ -210,12 +210,15 @@ Hello, World! My name is FrenchToast
 Hello, World! My name is Waffles
 ```
 
+We've done it!
+
 ## Custom Attributes
 
 In some cases it might make sense to allow users some kind of configuration.
-For our example the user might want to overwrite the name that is printed in the `hello_world()` method.
+For example, the user might want to overwrite the name that is printed in the `hello_world()` method.
 
 This can be achieved with custom attributes:
+
 ```rust,ignore
 #[derive(HelloWorld)]
 #[HelloWorldName = "the best Pancakes"]
@@ -232,8 +235,8 @@ If we try to compile this though, the compiler will respond with an error:
 error: The attribute `HelloWorldName` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
 ```
 
-The compiler needs to know that we handle this attribute and to not respond with an error.
-This is done in the `hello-world-derive`-crate by adding `attributes` to the `proc_macro_derive` attribute:
+The compiler needs to know that we're handling this attribute and to not respond with an error.
+This is done in the `hello-world-derive` crate by adding `attributes` to the `proc_macro_derive` attribute:
 
 ```rust,ignore
 #[proc_macro_derive(HelloWorld, attributes(HelloWorldName))]
@@ -244,11 +247,11 @@ Multiple attributes can be specified that way.
 
 ## Raising Errors
 
-Let's assume that we do not want to accept `Enums` as input to our custom derive method.
+Let's assume that we do not want to accept enums as input to our custom derive method.
 
 This condition can be easily checked with the help of `syn`. 
-But how to we tell the user, that we do not accept `Enums`. 
-The idiomatic was to report errors in procedural macros is to panic:
+But how do we tell the user, that we do not accept enums?
+The idiomatic way to report errors in procedural macros is to panic:
 
 ```rust,ignore
 fn impl_hello_world(ast: &syn::MacroInput) -> quote::Tokens {
@@ -257,14 +260,14 @@ fn impl_hello_world(ast: &syn::MacroInput) -> quote::Tokens {
     if let syn::Body::Struct(_) = ast.body {
         // Yes, this is a struct
         quote! {
-            impl HelloWorld for #name {                       
+            impl HelloWorld for #name {
                 fn hello_world() {
                     println!("Hello, World! My name is {}", stringify!(#name));
                 }
             }
         }
     } else {
-        //Nope. This is an Enum. We cannot handle these! 
+        //Nope. This is an Enum. We cannot handle these!
        panic!("#[derive(HelloWorld)] is only defined for structs, not for enums!");
     }
 }