Apply some light edits to the introduction

Author: ehuss

src/introduction.md

@@ -26,11 +26,11 @@ Rust compilers, including `rustc`, will perform optimizations. The reference doe
 
 ## How to use this book
 
-This book does not assume you are reading this book sequentially. Each chapter generally can be read standalone, but will cross-link to other chapters for facets of the language they refer to, but do not discuss.
+This book does not assume you are reading it sequentially. Each chapter generally can be read standalone, but will cross-link to other chapters for facets of the language they refer to but do not discuss.
 
 There are two main ways to read this document.
 
-The first is to answer a specific question. If you know which chapter answers that question, you can jump to that chapter in the table of contents. Otherwise, you can press `s` or click the magnifying glass on the top bar to search for keywords related to your question. For example, say you wanted to know when a temporary value created in a let statement is dropped. If you didn't already know that the [lifetime of temporaries] is defined in the [expressions chapter], you could search "temporary let" and the first search result will take you to that section.
+The first is to answer a specific question. If you know which chapter answers that question, you can jump to that chapter in the table of contents. Otherwise, you can press `s` or click the magnifying glass on the top bar to search for keywords related to your question. For example, say you wanted to know when a temporary value created in a `let` statement is dropped. If you didn't already know that the [lifetime of temporaries] is defined in the [expressions chapter], you could search "temporary let" and the first search result will take you to that section.
 
 The second is to generally improve your knowledge of a facet of the language. In that case, just browse the table of contents until you see something you want to know more about, and just start reading. If a link looks interesting, click it, and read about that section.
 
@@ -49,7 +49,7 @@ The latest release of this book, matching the latest Rust version, can always be
 
 We welcome contributions of all kinds.
 
-You can contribute to this book by opening an issue or sending a pull request to [the Rust Reference repository]. If this book does not answer your question, and you think its answer is in scope of it, please do not hesitate to [file an issue] or ask about it in the `t-lang/doc` stream on [Zulip]. Knowing what people use this book for the most helps direct our attention to making those sections the best that they can be. And of course, if you see anything that is wrong or is non-normative but not specifically called out as such, please also [file an issue].
+You can contribute to this book by opening an issue or sending a pull request to [the Rust Reference repository]. If this book does not answer your question and you think its answer is in scope, please do not hesitate to [file an issue] or ask about it in the `t-lang/doc` stream on [Zulip]. Knowing what people use this book for the most helps direct our attention to making those sections the best they can be. And of course, if you see anything that is wrong or is non-normative but not specifically called out as such, please also [file an issue].
 
 <!-- TODO: Link to contributing guide -->