some changes in faq.rst, added an example how to upload just a program part

Author: planrich

docs/faq.rst

@@ -7,11 +7,27 @@ Frequently Asked Questions
   If the symbol has been exported in the shared object (on linux), ``dladdr`` might still be able to extract
   the function name even if no debugging information has been attached.
 
+* **Is it possible to just profile a short part of my profile?**: Yes here an example how you could do just that:
+
+  ```
+  with open('test.prof', 'w+b') as fd:
+      vmprof.enable(fd.fileno())
+      my_function_or_program()
+      vmprof.disable()
+
+  ```
+
+  And upload it later when your program finishes.
+
+  $ python -m vmprof.upload test.prof
+
+
+
 * **What do the colors on vmprof.com mean?**: For plain CPython there is no particular meaning, we might change
   that in the future. For PyPy we have a color coding to show at which state the VM sampled (e.g. JIT, Warmup, ...).
 
 * **My Windows profile is malformed?**: Please ensure that you open the file in binary mode. Otherwise Windows
-  will transform `\n` to `\r\n`.
+  will transform ``\n`` to ``\r\n``.
 
 * **Do I need to install libunwind?**: Usually not. We ship python wheels that bundle libunwind shared objects. If you install vmprof from source, then you need to install the development headers of your distribution. OSX ships libunwind per default. If your pip version is really old it does not pull wheels and it will end up compiling from source.