Make it clear that ^ adds argument adter compiler name.

Author: abidh

clang/lib/Driver/Driver.cpp

@@ -7199,9 +7199,10 @@ static const char *GetStableCStr(llvm::StringSet<> &SavedStrings, StringRef S) {
 ///
 ///  '#': Silence information about the changes to the command line arguments.
 ///
-///  '^': Add FOO as a new argument at the beginning of the command line.
+///  '^FOO': Add FOO as a new argument at the beginning of the command line
+///  right after the name of the compiler executable.
 ///
-///  '+': Add FOO as a new argument at the end of the command line.
+///  '+FOO': Add FOO as a new argument at the end of the command line.
 ///
 ///  's/XXX/YYY/': Substitute the regular expression XXX with YYY in the command
 ///  line.

flang/docs/FlangDriver.md

@@ -621,11 +621,12 @@ nvfortran defines `-fast` as
 The environment variable `FCC_OVERRIDE_OPTIONS` can be used to edit flang's
 command line arguments. The value of this variable is a space-separated list of
 edits to perform. The edits are applied in the order in which they appear in
-`FCC_OVERRIDE_OPTIONS`. Each edit should be one of the following forms:
+`FCC_OVERRIDE_OPTIONS`. Each edit should be one of the following form:
 
 - `#`: Silence information about the changes to the command line arguments.
 
-- `^FOO`: Add `FOO` as a new argument at the beginning of the command line.
+- `^FOO`: Add `FOO` as a new argument at the beginning of the command line right
+  after the name of the compiler executable.
 
 - `+FOO`: Add `FOO` as a new argument at the end of the command line.