code review 5845065: doc/debugging_with_gdb: format & content update

doc/debugging_with_gdb.html

 <!--{
         "Title": "Debugging Go Code with GDB",
         "Path": "/ref/gdb"
 }-->
 
 <p><i>
-This applies to the gc toolchain. Gccgo has native gdb support. Besides this
-overview you might want to consult the
+This applies to the <code>gc</code> toolchain. Gccgo has native gdb support.
+Besides this overview you might want to consult the
 <a href="http://sourceware.org/gdb/current/onlinedocs/gdb/">GDB manual</a>.
 </i></p>
 
 <h2 id="Introduction">Introduction</h2>
 
 <p>
-When you compile and link your Go programs with the 6g/6l or 8g/8l toolchains
+When you compile and link your Go programs with the <code>gc</code> toolchain
 on Linux, Mac OS X or FreeBSD, the resulting binaries contain DWARFv3
 debugging information that recent versions (&gt;7.1) of the GDB debugger can
 use to inspect a live process or a core dump.
 </p>
 
 <p>
 Pass the <code>'-s'</code> flag to the linker to omit the debug information
 (for example, <code>go build -ldflags "-s" prog.go</code>).
 </p>
 
@@ skipping 320 matching lines @@
 $1 = (struct testing.T *) 0xf840688b60
 (gdb) p t
 $1 = (struct testing.T *) 0xf840688b60
 (gdb) p *t
 $2 = {errors = "", failed = false, ch = 0xf8406f5690}
 (gdb) p *t-&gt;ch
 $3 = struct hchan&lt;*testing.T&gt;
 </pre>
 
 <p>
-That <code>struct hchan&lt;*testing.T&gt;</code> is the runtime-internal represntation of a channel.  It is currently empty, or gdb would have pretty-printed it's contents.
+That <code>struct hchan&lt;*testing.T&gt;</code> is the runtime-internal representation of a channel.  It is currently empty, or gdb would have pretty-printed it's contents.
 </p>
 
 <p>
 Stepping forward:
 </p>
 
 <pre>
 (gdb) <b>n</b>  <i># execute next line</i>
 149             for _, test := range findTests {
 (gdb)    <i># enter is repeat</i>
@@ skipping 107 matching lines @@
 <pre>
 (gdb) <b>p i</b>
 $4 = {str = "cbb"}
 (gdb) <b>whatis i</b>
 type = regexp.input
 (gdb) <b>p $dtype(i)</b>
 $26 = (struct regexp.inputBytes *) 0xf8400b4930
 (gdb) <b>iface i</b>
 regexp.input: struct regexp.inputBytes *
 </pre>