debugger: Editorial changes in documentation

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diff --git a/lib/debugger/doc/src/introduction.xml b/lib/debugger/doc/src/introduction.xml
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+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+<header>
+    <copyright>
+      <year>1997</year><year>2013</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+ 
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+    
+    </legalnotice>
+
+    <title>Introduction</title>
+    <prepared></prepared>
+    <docno></docno>
+    <date></date>
+    <rev></rev>
+    <file>introduction.xml</file>
+  </header>
+
+  <section>
+    <title>Scope</title>
+    <p>Debugger is a graphical user interface for the Erlang
+      interpreter, which can be used for debugging and testing of
+      Erlang programs. For example, breakpoints can be set, code can be
+      single-stepped and variable values can be displayed and changed.
+    </p>
+
+    <p>The Erlang interpreter can also be accessed through the interface
+      module <seealso marker="int"><c>int(3)</c></seealso>.
+    </p>
+
+    <warning>
+      <p>Debugger might at some point
+      start tracing on the processes that execute the interpreted
+      code. This means that a conflict occurs if tracing by other
+      means is started on any of these processes.</p>
+    </warning>
+  </section>
+
+  <section>
+    <title>Prerequisites</title>
+    <p>It is assumed that the reader is familiar with the Erlang
+      programming language.</p>
+    <p>Modules to be debugged must include debug information,
+      for example, <c>erlc +debug_info MODULE.erl</c>.</p>
+  </section>
+
+</chapter>
+
+