various typo fixes.

Author: agentzh

en/00-Foreword01.tut

@@ -36,7 +36,7 @@ by me.
 L<http://openresty.org/|http://openresty.org/>
 
 All of the modules mentioned in these tutorials, including the Nginx stable
-core that is fresh enough, have included in this bundle.
+core that is fresh enough, have been included in this bundle.
 
 One principle that I've been trying to follow in these tutorials is to
 use small and concise configure examples to validate the concepts and principles
@@ -47,7 +47,7 @@ I keep adjusting and correcting my words according to the running results
 of my little samples in the process of writing.
 
 For problematic code samples, we will intentionally make them look different
-from those good samples, that is, all the lines of the bad samples will
+from those good samples, that is, all the lines of bad samples will
 be prefixed with a question mark, i.e., "C<?>". Here is an example:
 
     :nginx

en/01-NginxVariables01.tut

@@ -9,7 +9,7 @@ is heavily influenced by
 Perl and Bourne Shell as far as I can see, despite the fact that it might not
 be Turing-Complete and it is declarative in many places. This is a
 distinguishing feature of Nginx, as compared
-to the other web servers
+to other web servers
 like Apache or Lighttpd. Being a programming language, "variables" are
 thus a natural part of it (exceptions do exist, of course, as in pure
 functional languages like Haskell).
@@ -117,7 +117,7 @@ Luckily, workarounds do exist and here is one proposed by Maxim Dounin: first
 we assign to a variable a literal string containing a dollar sign character
 via a configuration directive that does I<not> support "variable interpolation"
 (remember that not all the directives support "variable interpolation"?), and
-then reference this variable later wherever we need a dollar sign. Here is such
+then reference this variable later whenever we need a dollar sign. Here is such
 an
 example to demonstrate the idea:
 
@@ -159,7 +159,7 @@ with the string C<"$"> unconditionally.
 There is a special case for "variable interpolation", that is, when the variable
 name is followed directly by characters allowed in variable names (like
 letters, digits, and underscores).
-In such cases we can use a special notation to disambiguate the variable name
+In such cases, we can use a special notation to disambiguate the variable name
 from the subsequent literal characters, for instance,
 
     :nginx

en/01-NginxVariables03.tut

@@ -133,7 +133,7 @@ the behavior of the L<ngx_proxy> module.
 
 We have already learned in previous sections that when reading the built-in
 variable L<ngx_core/$args>, Nginx executes a special piece of code to obtain a
-value on-the-fly and when writing to this variable, Nginx also executes another
+value on-the-fly and when writing to this variable, Nginx executes another
 special piece of code to propagate the change. In Nginx's terminology, the
 special code executed for reading the variable is called "get handler"
 and the code for writing to the variable is called "set handler". Different

en/02-NginxDirectiveExecOrder01.tut

@@ -88,7 +88,7 @@ from source:
     cd nginx-1.0.10/
     ./configure --with-debug
     make
-    sudu make install
+    sudo make install
 
 In case the package L<ngx_openresty|http://openresty.org> is used. The
 option C<--with-debug> can be used with its C<./configure> script as well.