Added links to guide

Author: davidcole1340

README.md

@@ -30,6 +30,8 @@ Calling the function from PHP:
 var_dump(hello_world("David")); // string(13) "Hello, David!"
 ```
 
+For more information read the [guide](https://davidcole1340.github.io/ext-php-rs/guide).
+
 ## Features
 
 - **Easy to use:** The built-in macros can abstract away the need to interact
@@ -55,6 +57,8 @@ Our main goal is to **make extension development easier.**
 
 ## Documentation
 
+The library guide can be read [here](https://davidcole1340.github.io/ext-php-rs/guide).
+
 The project is documented in-line, so viewing the `cargo` documentation is the
 best resource at the moment.
 

src/lib.rs

@@ -1,4 +1,6 @@
 //! Bindings and abstractions for the Zend API to build PHP extensions natively in Rust.
+//!
+//! The library guide can be read [here.](https://davidcole1340.github.io/ext-php-rs/guide)
 
 #![deny(clippy::unwrap_used)]
 #![allow(non_upper_case_globals)]

src/php/types/callable.rs

@@ -38,8 +38,7 @@ impl<'a> Deref for OwnedZval<'a> {
 }
 
 impl<'a> Callable<'a> {
-    /// Attempts to create a new [`Callable`]. Should not need to be used directly, but through the
-    /// [`Zval::callable`] method.
+    /// Attempts to create a new [`Callable`] from a zval.
     ///
     /// # Parameters
     ///

src/php/types/zval.rs

@@ -76,6 +76,8 @@ impl<'a> Zval {
     ///
     /// If the zval does not contain a string, the function will check if it contains a
     /// double or a long, and if so it will convert the value to a [`String`] and return it.
+    /// Don't rely on this logic, as there is potential for this to change to match the output
+    /// of the [`str()`](#method.str) function.
     pub fn string(&self) -> Option<String> {
         self.str()
             .map(|s| s.to_string())
@@ -84,8 +86,8 @@ impl<'a> Zval {
 
     /// Returns the value of the zval if it is a string.
     ///
-    /// Note that this functions output will not be the same as [`Zval::string`], as this
-    /// function does not attempt to convert other types into a [`String`], as it could not
+    /// Note that this functions output will not be the same as [`string()`](#method.string), as
+    /// this function does not attempt to convert other types into a [`String`], as it could not
     /// pass back a [`&str`] in those cases.
     pub fn str(&'a self) -> Option<&'a str> {
         if self.is_string() {