Documentation language corrections, contributed by Chris Pepper <pepper@mail.reppep.com>

INSTALL

diff --git a/INSTALL b/INSTALL
index ca4d403..f469145 100644
--- a/INSTALL
+++ b/INSTALL
@@ -122,7 +122,7 @@
      directory, and the binary will be in the "apps" directory.
 
      If "make" fails, look at the output.  There may be reasons for
-     the failure that isn't a problem in OpenSSL itself (like missing
+     the failure that aren't problems in OpenSSL itself (like missing
      standard headers).  If it is a problem with OpenSSL itself, please
      report the problem to <openssl-bugs@openssl.org> (note that your
      message will be forwarded to a public mailing list).  Include the