minor: Lower upper-case character at start of messages

Author: HugoGGuerrier

lkql_checker/src/gnatcheck-projects-aggregate.adb

@@ -202,7 +202,7 @@ package body Gnatcheck.Projects.Aggregate is
    begin
       if Full_Tool_Name = null then
          Error
-           ("Cannot locate "
+           ("cannot locate "
             & Executable
             & " on PATH, possible installation problem");
          raise Fatal_Error;
@@ -344,7 +344,7 @@ package body Gnatcheck.Projects.Aggregate is
       Iterator_El := Element (Iterator_C);
    exception
       when others =>
-         Error ("Cannot start iterator on aggregated projects");
+         Error ("cannot start iterator on aggregated projects");
          raise Fatal_Error;
    end Start_Prj_Iterator;
 

lkql_checker/src/gnatcheck-projects.adb

@@ -1590,7 +1590,7 @@ package body Gnatcheck.Projects is
       --  Check the correctness of setting custom name for text report file
 
       if Custom_Text_Report_File and then not Text_Report_ON then
-         Error ("Custom text output file cannot be set if text output is off");
+         Error ("custom text output file cannot be set if text output is off");
          raise Parameter_Error;
       end if;
 

lkql_checker/src/gnatcheck-rules-rule_table.adb

@@ -950,7 +950,7 @@ package body Gnatcheck.Rules.Rule_Table is
       --  Finally, check that the designated rule is not a compiler rule
       if Is_Compiler_Rule (Rule) then
          Error
-           ("Cannot enable a compiler based rule through the '--rule' CLI "
+           ("cannot enable a compiler based rule through the '--rule' CLI "
             & "option");
          Bad_Rule_Detected := True;
          return;