[Ada] Fix style in comments and code related to compilation units

[Pierre-Marie de Rodat]

Only style fixes; comments and code themselves are unchanged.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

        * lib-load.adb (Load_Unit): Fix style in comment.
        * par-load.adb (Load): Likewise.
        * scng.adb (Initialize_Scanner): Fix whitespace.
diff --git a/gcc/ada/lib-load.adb b/gcc/ada/lib-load.adb
--- a/gcc/ada/lib-load.adb
+++ b/gcc/ada/lib-load.adb
@@ -823,7 +823,7 @@ package body Lib.Load is
                      Units.Table (Calling_Unit).Fatal_Error := Error_Detected;
 
                   --  If with'ed unit had an ignored error, then propagate it
-                  --  but do not overide an existring setting.
+                  --  but do not overide an existing setting.
 
                   when Error_Ignored =>
                      if Units.Table (Calling_Unit).Fatal_Error = None then
@@ -900,7 +900,7 @@ package body Lib.Load is
                Remove_Unit (Unum);
 
             --  If unit not required, remove load stack entry and the junk
-            --  file table entry, and return No_Unit to indicate not found,
+            --  file table entry, and return No_Unit to indicate not found.
 
             else
                Load_Stack.Decrement_Last;


diff --git a/gcc/ada/par-load.adb b/gcc/ada/par-load.adb
--- a/gcc/ada/par-load.adb
+++ b/gcc/ada/par-load.adb
@@ -129,8 +129,8 @@ begin
    Save_Style_Check_Options (Save_Style_Checks);
    Save_Style_Check := Opt.Style_Check;
 
-   --  If main unit, set Main_Unit_Entity (this will get overwritten if
-   --  the main unit has a separate spec, that happens later on in Load)
+   --  If main unit, set Main_Unit_Entity (this will get overwritten if the
+   --  main unit has a separate spec, that happens later on in Load).
 
    if Cur_Unum = Main_Unit then
       Main_Unit_Entity := Cunit_Entity (Main_Unit);


diff --git a/gcc/ada/scng.adb b/gcc/ada/scng.adb
--- a/gcc/ada/scng.adb
+++ b/gcc/ada/scng.adb
@@ -230,16 +230,16 @@ package body Scng is
 
       --  Initialize scan control variables
 
-      Current_Source_File       := Index;
-      Source                    := Source_Text (Current_Source_File);
-      Scan_Ptr                  := Source_First (Current_Source_File);
-      Token                     := No_Token;
-      Token_Ptr                 := Scan_Ptr;
-      Current_Line_Start        := Scan_Ptr;
-      Token_Node                := Empty;
-      Token_Name                := No_Name;
-      Start_Column              := Set_Start_Column;
-      First_Non_Blank_Location  := Scan_Ptr;
+      Current_Source_File      := Index;
+      Source                   := Source_Text (Current_Source_File);
+      Scan_Ptr                 := Source_First (Current_Source_File);
+      Token                    := No_Token;
+      Token_Ptr                := Scan_Ptr;
+      Current_Line_Start       := Scan_Ptr;
+      Token_Node               := Empty;
+      Token_Name               := No_Name;
+      Start_Column             := Set_Start_Column;
+      First_Non_Blank_Location := Scan_Ptr;
 
       Initialize_Checksum;
       Wide_Char_Byte_Count := 0;