rewording

Author: aollier

README.asc

@@ -31,7 +31,7 @@ Converting to PDF...
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 An alternative to calling the `bundle` command is to call directly the `asciidoctor` command.
-If it is the first time you build the book, it is necessary to create the _images_ folder and fill it.
+If it is the first time you're building the book, it is necessary to create the _images_ folder and fill it.
 Do the following only once:
 
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@@ -40,7 +40,7 @@ $ cp book/*/images/* images/
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 Then you can build the book.
-You can also use the following commands:
+Use the following commands:
 
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 $ asciidoctor-pdf progit.asc