[llvm-dwarfdump] Simplify --ignore-case help text and documentation

There was a typo in the --ignore-case help text that was copied into the
llvm-dwarfdump command-guide. Additionally, this patch simplifies the
wording, since it was unnecessarily verbose: the switch applies for
searching in general and doesn't need explicitly stating different
search modes (which might go out-of-date as options are added or
removed).

Reviwed by: JDevlieghere

Differential Revision: https://reviews.llvm.org/D63133

llvm-svn: 363066

docs/CommandGuide/llvm-dwarfdump.rst

@@ -53,8 +53,7 @@ OPTIONS
 
 .. option:: -i, --ignore-case
 
-            Ignore case distinctions in when searching entries by name
-            or by regular expression.
+            Ignore case distinctions when searching.
 
 .. option:: -n <pattern>, --name=<pattern>
 

tools/llvm-dwarfdump/llvm-dwarfdump.cpp

@@ -141,9 +141,8 @@ static list<std::string>
               "-name option can be used instead."),
          value_desc("name"), cat(DwarfDumpCategory));
 static alias FindAlias("f", desc("Alias for -find."), aliasopt(Find));
-static opt<bool>
-    IgnoreCase("ignore-case",
-               desc("Ignore case distinctions in when searching by name."),
+static opt<bool> IgnoreCase("ignore-case",
+                            desc("Ignore case distinctions when searching."),
                             value_desc("i"), cat(DwarfDumpCategory));
 static alias IgnoreCaseAlias("i", desc("Alias for -ignore-case."),
                              aliasopt(IgnoreCase));