Fixed many comments

libsrc/common/ctype.s

@@ -7,7 +7,7 @@
 ;
 ; See "LICENSE" file for legal information.
 ;
-; Character specification table, matching serveral consoles.
+; Character specification table, matching several consoles.
 ;
 
         .include        "ctypetable.inc"

libsrc/common/mktime.s

@@ -423,10 +423,10 @@ finish_calc:
         jsr     tosaddeax       ; Simple addition there
 
         ; No need to store/load/push the counter here, simply to push it
-        ; for the last substraction
+        ; for the last subtraction
         jsr     pusheax
 
-        ; Substract timezone
+        ; Subtract timezone
         lda     __tz+1+3
         sta     sreg+1
         lda     __tz+1+2

libsrc/common/realloc.s

@@ -110,7 +110,7 @@ _realloc:
 
         tya                     ; Put ___heapptr back in A
         sec                     ; Check if we have enough memory at heap top
-        sbc     oldsize         ; Substract oldsize
+        sbc     oldsize         ; Subtract oldsize
         sta     newblock
         lda     ___heapptr+1
         sbc     oldsize+1

libsrc/common/strlen.s

@@ -2,7 +2,7 @@
 ; Ullrich von Bassewitz, 31.05.1998
 ;
 ; Note: strspn & strcspn call internally this function and rely on
-; the usage of only ptr4 here! Keep in mind when appling changes
+; the usage of only ptr4 here! Keep in mind when applying changes
 ; and check the other implementations too!
 ;
 ; size_t __fastcall__ strlen (const char* s);

libsrc/common/vsprintf.s

@@ -30,7 +30,7 @@ _vsprintf:
         ldy     #2
         jsr     staxysp
 
-; Contine by jumping to vsnprintf, which expects ap on the CPU stack and will
+; Continue by jumping to vsnprintf, which expects ap on the CPU stack and will
 ; cleanup the C stack
 
         jmp     vsnprintf