Spelling fixes

Spelling errors found using github.com/lucasdemarchi/codespell
A tool to fix common misspellings.
This tool is licensed under GNU General Public License, version 2.

Change-Id: Ib95e14205fe5fa72c27f35305c822234052420ef
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/configure.ac b/configure.ac
index 1429253..b703403 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,8 +30,8 @@
 AX_APPEND_COMPILE_FLAGS([-fpic -Wall -Werror], [CXXFLAGS])
 
 # Checks for header files.
-AC_CHECK_HEADER(systemd/sd-bus.h, ,[AC_MSG_ERROR([Could not find systemd/sd-bus.h...systemd developement package required])])
-AC_CHECK_HEADER(sdbusplus/server.hpp, ,[AC_MSG_ERROR([Could not find sdbusplus/server.hpp...sdbusplus developement package required])])
+AC_CHECK_HEADER(systemd/sd-bus.h, ,[AC_MSG_ERROR([Could not find systemd/sd-bus.h...systemd development package required])])
+AC_CHECK_HEADER(sdbusplus/server.hpp, ,[AC_MSG_ERROR([Could not find sdbusplus/server.hpp...sdbusplus development package required])])
 
 # Checks for library functions.
 LT_INIT # Removes 'unrecognized options: --with-libtool-sysroot'
diff --git a/events.hpp b/events.hpp
index 38c24e4..a6e3a5d 100644
--- a/events.hpp
+++ b/events.hpp
@@ -14,7 +14,7 @@
 /** @struct Event
  *  @brief Event object interface.
  *
- *  The event base is an assocation of an event type
+ *  The event base is an association of an event type
  *  and an array of filter callbacks.
  */
 struct Event : public std::vector<Filter>