Remove redundant command in CMake

Modify man page doc

Author: snarang181

flang/docs/CMakeLists.txt

@@ -151,9 +151,6 @@ if (LLVM_ENABLE_SPHINX)
         COMMAND "${CMAKE_COMMAND}" -E copy
                 "${CMAKE_CURRENT_SOURCE_DIR}/index.rst"
                 "${CMAKE_CURRENT_BINARY_DIR}/Source/index.rst"
-        COMMAND "${CMAKE_COMMAND}" -E copy
-                "${CMAKE_CURRENT_BINARY_DIR}/Source/FlangCommandLineReference.rst"
-                "${CMAKE_CURRENT_BINARY_DIR}/Source/FlangCommandLineReference.rst"
         DEPENDS flang-doc gen-FlangCommandLineReference.rst)
 
       add_sphinx_target(man flang SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/Source")

flang/docs/index.rst

@@ -8,7 +8,8 @@ For full documentation, please see the online HTML docs:
 
 https://flang.llvm.org/docs/
 
-TODO: This man page currently shows FlangCommandLineReference, will be ultimately replaced with finalized man page content.
+..  
+  The placeholder text "FlangCommandLineReference" below should eventually be replaced with the actual man page contents.  
 
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