docs/buildroot: use DESTDIR / install-strip for target install example

docs/buildroot.html

@@ -1014,7 +1014,7 @@ endif
     <a name="ex2line34" id="ex2line34">34</a>          $(MAKE) CC=$(TARGET_CC) -C $(FOO_DIR)
     <a name="ex2line35" id="ex2line35">35</a>
     <a name="ex2line36" id="ex2line36">36</a>  $(TARGET_DIR)/$(FOO_TARGET_BINARY): $(FOO_DIR)/$(FOO_BINARY)
-    <a name="ex2line37" id="ex2line37">37</a>          $(MAKE) prefix=$(TARGET_DIR)/usr -C $(FOO_DIR) install
+    <a name="ex2line37" id="ex2line37">37</a>          $(MAKE) DESTDIR=$(TARGET_DIR) -C $(FOO_DIR) install-strip
     <a name="ex2line38" id="ex2line38">38</a>          rm -Rf $(TARGET_DIR)/usr/man
     <a name="ex2line39" id="ex2line39">39</a>
     <a name="ex2line40" id="ex2line40">40</a>  foo: uclibc ncurses $(TARGET_DIR)/$(FOO_TARGET_BINARY)
@@ -1111,8 +1111,8 @@ endif
     <p>Lines <a href="#ex2line36">36-38</a> defines a target and associated rules
     that install the software inside the target filesystem. It depends on the
     binary file in the source directory, to make sure the software has
-    been compiled. It uses the <code>install</code> target of the
-    software <code>Makefile</code> by passing a <code>prefix</code>
+    been compiled. It uses the <code>install-strip</code> target of the
+    software <code>Makefile</code> by passing a <code>DESTDIR</code>
     argument, so that the <code>Makefile</code> doesn't try to install
     the software inside host <code>/usr</code> but inside target
     <code>/usr</code>. After the installation, the