analyzer.opt: rewrite description of -fdump-analyzer-callgraph [PR 93692]

gcc/analyzer/ChangeLog:
	PR analyzer/93692
	* analyzer.opt (fdump-analyzer-callgraph): Rewrite description.

gcc/analyzer/ChangeLog

+2020-02-18  David Malcolm  <dmalcolm@redhat.com>
+
+	PR analyzer/93692
+	* analyzer.opt (fdump-analyzer-callgraph): Rewrite description.
+
 2020-02-18  David Malcolm  <dmalcolm@redhat.com>
 
 	PR analyzer/93777

gcc/analyzer/analyzer.opt

@@ -152,7 +152,7 @@ Dump various analyzer internals to stderr.
 
 fdump-analyzer-callgraph
 Common RejectNegative Var(flag_dump_analyzer_callgraph)
-Dump the analyzer supergraph to a SRCFILE.callgraph.dot file.
+Dump analyzer-specific call graph information to a SRCFILE.callgraph.dot file.
 
 fdump-analyzer-exploded-graph
 Common RejectNegative Var(flag_dump_analyzer_exploded_graph)