Fix error in cast format example

+ misc copy edit

Author: mrotteveel

doc/sql.extensions/README.cast.format.md

@@ -22,14 +22,14 @@ The following patterns are currently implemented for datetime to string conversi
 | DDD | Day of the Year (001 - 366) |
 | DY | Short name of the Day (Mon) |
 | J | Julian Day (number of days since January 1, 4712 BC) |
-| HH / HH12 | Hour of the Day (01 - 12) without Period (for Period use A.M or P.M.)  |
+| HH / HH12 | Hour of the Day (01 - 12) without Period (for Period use A.M. or P.M.)  |
 | HH24 | Hour of the Day (00 - 23) |
 | MI | Minutes (00 - 59) |
 | SS | Seconds (00 - 59) |
 | SSSSS | Seconds after midnight (0 - 86399) |
 | FF1 - FF9 | Fractional seconds with the specified accuracy |
 | A.M. / P.M. | Period for 12 hours time (it doesn't matter which one is used, period will be inserted based on time) |
-| TZH | Time zone in Hours  (-14 - 14) |
+| TZH | Time zone in Hours (-14 - 14) |
 | TZM | Time zone in Minutes (00 - 59) |
 | TZR | Time zone Name |
 
@@ -60,7 +60,7 @@ Example:
 ```
 SELECT CAST(CURRENT_TIMESTAMP AS VARCHAR(45) FORMAT 'DD.MM.YEAR HH24:MI:SS "is" J "Julian day"') FROM RDB$DATABASE;
 =========================
-14.6.2023 15:41:29 is 2460110 Julian day
+14.06.2023 15:41:29 is 2460110 Julian day
 ```
 
 ## 2. STRING TO DATETIME