Bug #1098497: various small typo's, grammar and markup nits.

Doc/tut/tut.tex

@@ -75,7 +75,7 @@ Reference}.
 If you ever wrote a large shell script, you probably know this
 feeling: you'd love to add yet another feature, but it's already so
 slow, and so big, and so complicated; or the feature involves a system
-call or other function that is only accessible from C \ldots Usually
+call or other function that is only accessible from C\ldots\ Usually
 the problem at hand isn't serious enough to warrant rewriting the
 script in C; perhaps the problem requires variable-length strings or
 other data types (like sorted lists of file names) that are easy in
@@ -313,7 +313,7 @@ platforms, this first line must end with a \UNIX-style line ending
 the hash, or pound, character, \character{\#}, is used to start a
 comment in Python.
 
-The script can be given a executable mode, or permission, using the
+The script can be given an executable mode, or permission, using the
 \program{chmod} command:
 
 \begin{verbatim}
@@ -852,7 +852,7 @@ auto-conversions where necessary.
 
 Unicode has the advantage of providing one ordinal for every character
 in every script used in modern and ancient texts. Previously, there
-were only 256 possible ordinals for script characters and texts were
+were only 256 possible ordinals for script characters. Texts were
 typically bound to a code page which mapped the ordinals to script
 characters. This lead to very much confusion especially with respect
 to internationalization (usually written as \samp{i18n} ---
@@ -867,7 +867,7 @@ normal strings:
 u'Hello World !'
 \end{verbatim}
 
-The small \character{u} in front of the quote indicates that an
+The small \character{u} in front of the quote indicates that a
 Unicode string is supposed to be created. If you want to include
 special characters in the string, you can do so by using the Python
 \emph{Unicode-Escape} encoding. The following example shows how: