[docs][llvm-dwarfdump] Normalise some wording

llvm-svn: 365603
diff --git a/llvm/docs/CommandGuide/llvm-dwarfdump.rst b/llvm/docs/CommandGuide/llvm-dwarfdump.rst
index 9f49f84..b8de084 100644
--- a/llvm/docs/CommandGuide/llvm-dwarfdump.rst
+++ b/llvm/docs/CommandGuide/llvm-dwarfdump.rst
@@ -25,7 +25,7 @@
 
 .. option:: -a, --all
 
-            Disassemble all supported DWARF sections.
+            Dump all supported DWARF sections.
 
 .. option:: --arch=<arch>