Doc: fix misleading documentation of QProcess::set[Process]Environment

The example suggested that QProcess searches the PATH variable to find
the executable for the child process. That's not true. The environment
that's passed with setProcessEnvironment is just passed to the child
process. Removed the misleading example and fixed the function's
description.

Task-number: QTBUG-7321
Change-Id: I8ac4b6b02002eb0a99686f09bcf45f9bc677c8e2
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

src/corelib/doc/snippets/qprocess-environment/main.cpp

@@ -47,7 +47,6 @@ void startProcess()
 QProcess process;
 QStringList env = QProcess::systemEnvironment();
 env << "TMPDIR=C:\\MyApp\\temp"; // Add an environment variable
-env.replaceInStrings(QRegExp("^PATH=(.*)", Qt::CaseInsensitive), "PATH=\\1;C:\\Bin");
 process.setEnvironment(env);
 process.start("myapp");
 //! [0]
@@ -58,7 +57,6 @@ process.start("myapp");
 QProcess process;
 QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
 env.insert("TMPDIR", "C:\\MyApp\\temp"); // Add an environment variable
-env.insert("PATH", env.value("Path") + ";C:\\Bin");
 process.setProcessEnvironment(env);
 process.start("myapp");
 //! [1]

src/corelib/io/qprocess.cpp

@@ -1659,11 +1659,10 @@ QProcess::ProcessState QProcess::state() const
 
 /*!
     \deprecated
-    Sets the environment that QProcess will use when starting a process to the
+    Sets the environment that QProcess will pass to the child process.
-    \a environment specified which consists of a list of key=value pairs.
+    The parameter \a environment is a list of key=value pairs.
 
-    For example, the following code adds the \c{C:\\BIN} directory to the list of
+    For example, the following code adds the environment variable \c{TMPDIR}:
-    executable paths (\c{PATHS}) on Windows:
 
     \snippet qprocess-environment/main.cpp 0
 
@@ -1679,7 +1678,7 @@ void QProcess::setEnvironment(const QStringList &environment)
 
 /*!
     \deprecated
-    Returns the environment that QProcess will use when starting a
+    Returns the environment that QProcess will pass to its child
     process, or an empty QStringList if no environment has been set
     using setEnvironment(). If no environment has been set, the
     environment of the calling process will be used.
@@ -1697,11 +1696,9 @@ QStringList QProcess::environment() const
 
 /*!
     \since 4.6
-    Sets the environment that QProcess will use when starting a process to the
+    Sets the \a environment that QProcess will pass to the child process.
-    \a environment object.
 
-    For example, the following code adds the \c{C:\\BIN} directory to the list of
+    For example, the following code adds the environment variable \c{TMPDIR}:
-    executable paths (\c{PATHS}) on Windows and sets \c{TMPDIR}:
 
     \snippet qprocess-environment/main.cpp 1
 
@@ -1717,7 +1714,7 @@ void QProcess::setProcessEnvironment(const QProcessEnvironment &environment)
 
 /*!
     \since 4.6
-    Returns the environment that QProcess will use when starting a
+    Returns the environment that QProcess will pass to its child
     process, or an empty object if no environment has been set using
     setEnvironment() or setProcessEnvironment(). If no environment has
     been set, the environment of the calling process will be used.