Documentation: Fix spelling / formatting errors (#12287)

The patch fixes the following problems spotted by lintian:

W: cmake-data: manpage-has-errors-from-man usr/share/man/man1/cmakemodules.1.gz 2641: warning [p 39, 1.5i]: can't break line
I: cmake-data: spelling-error-in-manpage usr/share/man/man1/cmakeprops.1.gz explict explicit
I: cmake: spelling-error-in-binary usr/bin/cmake explict explicit
I: cmake: spelling-error-in-binary usr/bin/cpack explict explicit
I: cmake: spelling-error-in-binary usr/bin/ctest explict explicit
W: cmake: manpage-has-errors-from-man usr/share/man/man1/cmake.1.gz 7300: warning [p 120, 3.3i]: can't break line
I: cmake: spelling-error-in-manpage usr/share/man/man1/cmake.1.gz explict explicit
I: cmake-curses-gui: spelling-error-in-binary usr/bin/ccmake explict explicit
I: cmake-qt-gui: spelling-error-in-binary usr/bin/cmake-gui explict explicit

Modules/FindArmadillo.cmake

@@ -1,15 +1,11 @@
 # - Find Armadillo
 # Find the Armadillo C++ library
 #
-#
-# == Using Armadillo: ==
-#  find_package(Armadillo RECQUIRED)
+# Using Armadillo:
+#  find_package(Armadillo REQUIRED)
 #  include_directories(${ARMADILLO_INCLUDE_DIRS})
 #  add_executable(foo foo.cc)
 #  target_link_libraries(foo ${ARMADILLO_LIBRARIES})
-#
-#=============================================================================
-#
 # This module sets the following variables:
 #  ARMADILLO_FOUND - set to true if the library is found
 #  ARMADILLO_INCLUDE_DIRS - list of required include directories
@@ -19,7 +15,6 @@
 #  ARMADILLO_VERSION_PATCH - patch version number
 #  ARMADILLO_VERSION_STRING - version number as a string (ex: "1.0.4")
 #  ARMADILLO_VERSION_NAME - name of the version (ex: "Antipodean Antileech")
-#
 
 #=============================================================================
 # Copyright 2011 Clement Creusot <[email protected]>

Source/cmComputeLinkDepends.cxx

@@ -69,7 +69,7 @@ We can also infer the edge
 because *every* time A appears B is seen on its right.  We do not know
 whether A really needs symbols from B to link, but it *might* so we
 must preserve their order.  This is the case also for the following
-explict lists:
+explicit lists:
 
   X: A B Y
   Y: A B

Source/cmTarget.cxx

@@ -590,7 +590,7 @@ void cmTarget::DefineProperties(cmake *cm)
      "For an executable with exports (see the ENABLE_EXPORTS property) "
      "no default transitive link dependencies are used.  "
      "This property replaces the default transitive link dependencies with "
-     "an explict list.  "
+     "an explicit list.  "
      "When the target is linked into another target the libraries "
      "listed (and recursively their link interface libraries) will be "
      "provided to the other target also.  "