fix typo

doc/src/Build_development.rst

@@ -155,7 +155,7 @@ LAMMPS and the test programs) and will download and compile a specific
 version of the `GoogleTest <https://github.com/google/googletest/>`_ C++
 test framework that is used to implement the tests.  Those unit tests
 may be combined with memory access and leak checking with valgrind
-(see below for how to enabled it).  In that case, running so-called
+(see below for how to enable it).  In that case, running so-called
 death tests will create a lot of false positives and thus they can be
 disabled by configuring compilation with the additional setting
 ``-D SKIP_DEATH_TESTS=on``.