Documentation/bad_memory.txt: convert it to ReST markup

- promote the section level of the document name;
- add/remove spaces/new lines where needed to format the output;
- use quote blocks.
- add it to the user book.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/bad_memory.txt

+How to deal with bad memory e.g. reported by memtest86+ ?
+=========================================================
+
 March 2008
 Jan-Simon Moeller, dl9pf@gmx.de
 
 
-How to deal with bad memory e.g. reported by memtest86+ ?
-#########################################################
 
 There are three possibilities I know of:
 
@@ -19,6 +20,7 @@ This Howto is about number 3) .
 
 BadRAM
 ######
+
 BadRAM is the actively developed and available as kernel-patch
 here:  http://rick.vanrein.org/linux/badram/
 
@@ -31,15 +33,19 @@ memmap is already in the kernel and usable as kernel-parameter at
 boot-time.  Its syntax is slightly strange and you may need to
 calculate the values by yourself!
 
-Syntax to exclude a memory area (see kernel-parameters.txt for details):
-memmap=<size>$<address>
+Syntax to exclude a memory area (see kernel-parameters.txt for details)::
+
+	memmap=<size>$<address>
 
 Example: memtest86+ reported here errors at address 0x18691458, 0x18698424 and
-         some others. All had 0x1869xxxx in common, so I chose a pattern of
-         0x18690000,0xffff0000.
+some others. All had 0x1869xxxx in common, so I chose a pattern of
+0x18690000,0xffff0000.
+
+With the numbers of the example above::
+
+	memmap=64K$0x18690000
+
+or::
 
-With the numbers of the example above:
-memmap=64K$0x18690000
- or
-memmap=0x10000$0x18690000
+	memmap=0x10000$0x18690000