fix typos

winsup/cygwin/how-to-debug-cygwin.txt

@@ -1,12 +1,12 @@
 Copyright 2001 Red Hat Inc., Egor Duda
 
-So, your favourite program has crashed? And did you say something about
+So, your favorite program has crashed? And did you say something about
 'stackdump'? Or it just prints its output from left to right and upside-down?
 Well, you can file an angry bug report and wait until some of the core
 developers try to reproduce your problem, try to find what's the matter
 with your program and cygwin and fix the bug, if any. But you can do something
 better than that. You can debug the problem yourself, and even if you can't
-fix it, your analysis may be very helpful. Here's the (incoplete) howto on 
+fix it, your analysis may be very helpful. Here's the (incomplete) howto on 
 cygwin debugging.
 
 1. The first thing you'll need to do is to build cygwin1.dll and your crashed
@@ -19,7 +19,7 @@ is normally stripped from executables.
 - create a wrapper c:\cygdeb\debug_wrapper.cmd:
 
 ========= debug_wrapper.cmd =========
-rem setting CYGWIN_TESTING environement variable makes cygwin application
+rem setting CYGWIN_TESTING environment variable makes cygwin application
 rem not to interfere with other already running cygwin applications.
 set CYGWIN_TESTING=1
 c:\cygdeb\gdb.exe -nw %1 %2
@@ -36,7 +36,7 @@ c:\cygdeb\gdb.exe -nw %1 %2
   If you know where the problem approximately is, you can add a bunch of 
   additional debug_printf()s in the source code and see what they print in 
   strace log. There's one common problem with this method, that some bugs
-  may misteriously disappear once the program is run under strace. Then the
+  may mysteriously disappear once the program is run under strace. Then the
   bug is likely a race condition. strace has two useful options to deal with
   such situation: -b enables buffering of output and reduces additional
   timeouts introduced by strace, and -m option allows you to mask certain
@@ -48,7 +48,7 @@ c:\cygdeb\gdb.exe -nw %1 %2
   another environment variable that may help. Create program_wrapper.cmd:
 
 ========= program_wrapper.cmd =========
-rem setting CYGWIN_SLEEP environement variable makes cygwin application
+rem setting CYGWIN_SLEEP environment variable makes cygwin application
 rem to sleep for x milliseconds at startup
 set CYGWIN_SLEEP=20000
 c:\some\path\bad_program.exe some parameters
@@ -70,4 +70,4 @@ c:\some\path\bad_program.exe some parameters
   build special version of cygwin1.dll which includes heap sanity checking.
   To do it, just add --enable-malloc-debugging option to configure. Be warned,
   however, that this version of dll is _very_ slow (10-100 times slower than
-  normal), so use it only when absolutely neccessary.
+  normal), so use it only when absolutely necessary.