Bugfix: Correct English grammar regarding "'s"

doc/Doxyfile

@@ -203,7 +203,7 @@ TAB_SIZE               = 8
 # For example adding "sideeffect=\par Side Effects:\n" will allow you to 
 # put the command \sideeffect (or @sideeffect) in the documentation, which 
 # will result in a user-defined paragraph with heading "Side Effects:". 
-# You can put \n's in the value part of an alias to insert newlines.
+# You can put \n in the value part of an alias to insert newlines.
 
 ALIASES                = 
 

doc/Tor.txt

@@ -56,8 +56,8 @@ config file):
   HiddenServiceDir /var/lib/tor/bitcoin-service/
   HiddenServicePort 8333 127.0.0.1:8333
 
-The directory can be different of course, but (both) 8333's should be equal to your
-bitcoind's P2P listen port (8333 by default).
+The directory can be different of course, but (both) port numbers should be equal to
+your bitcoind's P2P listen port (8333 by default).
 
 -externalip=X   You can tell bitcoin about its publicly reachable address using
                 this option, and this can be a .onion address. Given the above

doc/unit-tests.txt

@@ -12,9 +12,9 @@ make -f makefile.unix test_bitcoin  # Replace makefile.unix if you're not on uni
 If all tests succeed the last line of output will be:
 *** No errors detected
 
-To add more tests, add BOOST_AUTO_TEST_CASE's to the existing
+To add more tests, add BOOST_AUTO_TEST_CASE functions to the existing
 .cpp files in the test/ directory or add new .cpp files that
-implement new BOOST_AUTO_TEST_SUITE's (the makefiles are
+implement new BOOST_AUTO_TEST_SUITE sections (the makefiles are
 set up to add test/*.cpp to test_bitcoin automatically).