Merge pull request #33 from citizen428/citizen428-chapter-2

Chapter 2 fixes.
Thanks for the ongoing review!

en/chapter-02/contents.texinfo

@@ -67,7 +67,7 @@ Smalltalk allClasses size
 to teach classes, you will likely see
 a much larger number.}
 
-To be honest, in our previous chapter we skipped this important detail
+To be honest, in our previous chapter, we skipped this important detail
 on Smalltalk design. We wrote about message sending without explaining
 much, we wanted you to discover this design informally.
 The scripts you
@@ -104,8 +104,8 @@ There are three kinds of messages in @cuis{}:
 
 @end itemize
 
-Unary message selectors consist of alphanumeric characters, and start
-with a lower case letter.
+Unary message selectors consist of alphanumeric characters and start
+with a lowercase letter.
 
 Binary message selectors consist of one or more characters from the
 following set:
@@ -117,7 +117,7 @@ keywords, where each keyword starts with a lower-case letter and ends
 with a colon.
 
 @cindex message @subentry precedence
-Unary messages have the highest precedence, then binary messages, and
+Unary messages have the highest precedence, followed by binary messages, and
 finally keyword messages, so:
 
 @smalltalkExample{2 raisedTo: 1 + 3 factorial
@@ -138,7 +138,7 @@ is not 7. Parentheses must be used to alter the order of evaluation:
 @result{} 7}
 
 Parentheses can also be used to make potentially confusing code more
-clear. For example, the strict left to right evaluation order can be
+clear. For example, the strict left-to-right evaluation order can be
 confusing when applied to mathematical expressions. In the Spacewar!
 code snippet below, the parentheses make it more clear that the
 addition happens first:
@@ -176,11 +176,11 @@ The @class{Transcript} class is frequently helpful in presenting
 useful information when developing an application. An alternative to
 the @kbd{Ctrl-d} (@emph{@b{D}o it}) shortcut is @kbd{Ctrl-p}
 (@emph{@b{P}rint it}), which executes the script and prints the result
-direcly in the Workspace.
+directly in the Workspace.
 
 In the @ref{helloCascade}, we have requested no special result.  Selecting the
 text and typing @kbd{Ctrl-p} results in the default, which is to
-return the object to which a message is sent, in this case the
+return the object to which a message is sent, in this case, the
 @class{Transcript}.
 
 @node Message to string entities
@@ -189,7 +189,7 @@ return the object to which a message is sent, in this case the
 @cindex string @subentry Unicode
 @cindex Unicode
 As previously stated, a @class{String} is a sequence of @class{Character} 
-elements, and repersents plain Text (without any formatting).
+elements, and represents plain Text (without any formatting).
 
 In Cuis, as in most programming languages, @class{String} literals are a convenient syntax for creating @class{String} instances. These are some examples of @class{String} literals:
 
@@ -273,7 +273,7 @@ Messages naturally compose:
 
 An @class{Array} literal starts with a hash or sharp character, @smalltalk{$#}
 and parentheses surround the elements of the array.
-In this case the elements are @class{Character}s, but they can
+In this case, the elements are @class{Character}s, but they can
 be instances of any class.
 
 Like @smalltalk{#shuffled}, all collections answer to the message
@@ -348,7 +348,7 @@ keyword message to the number:
 117 isDivisibleBy: 9 @result{} true}
 
 @cindex number @subentry integer @subentry @method{gcd:} (great common divisor)
-@cindex number @subentry integer @subentry @method{lcm:} (lest common multiple)
+@cindex number @subentry integer @subentry @method{lcm:} (least common multiple)
 With specific @dfn{keyword messages} you can compute the Least Common
 Multiple and Greatest Common Divisor. A keyword message is composed of
 one or more colons ``:'' to insert one or more arguments:
@@ -373,11 +373,11 @@ done with message sending (See @ref{motionEquations}):
 @cindex browser
 
 Smalltalk organizes instance behaviors using classes.  
-A class is an object which holds a set of methods to be executed
+A class is an object that holds a set of methods to be executed
 when one of its instances receives a message
 that is the name of one of these methods.
 
-The @dfn{System Browser}, in short the @dfn{Browser}, is a tool to
+The @dfn{System Browser}, in short, the @dfn{Browser}, is a tool to
 rule all the classes in @cuis{}. It is both a tool to explore the
 classes (system or user ones) and to write new classes and methods.
 
@@ -504,7 +504,7 @@ on the class name will open a Browser on the named class:
 @section Spacewar! models
 
 @subsection First classes
-In the last chapter we listed the protagonists of the game. Now, we
+In the last chapter, we listed the protagonists of the game. Now, we
 propose a first implementation of the game model with a set of classes
 representing the involved entities:
 
@@ -610,7 +610,7 @@ environment, use the File List tool:
 You can also drag and drop the package file from your operating system
 over to the Squeak window. Upon dropping the file over the window
 @cuis{} will ask you what you want to do with this package.  To
-install it in your enviroment you can simply press @label{Install
+install it in your environment you can simply press @label{Install
 package}.
 
 Or, you can open a Workspace, type in @smalltalk{Feature require: 'Spacewar!'}