Fix several minor issues in docs

getenv() is not in datatime
rawdelete() method requires slot name

Author: VasiliyRyabtsev

doc/source/reference/language/builtin_functions.rst

@@ -366,7 +366,7 @@ tries to get a value from the slot 'key' without employing delegation
 Sets the slot 'key' with the value 'val' without employing delegation. If the slot does not exists, it will be created. Returns table itself.
 
 
-.. sq:function:: table.rawdelete()
+.. sq:function:: table.rawdelete(key)
 
 Deletes the slot key without employing delegation and returns its value. If the slot does not exists, returns null.
 

doc/source/stdlib/stddatetimelib.rst

@@ -1,8 +1,8 @@
 .. _stdlib_stddatetimelib:
 
-==================
+====================
 The Datetime library
-==================
+====================
 
 The datetime library date and time manipulation facilities
 
@@ -44,10 +44,6 @@ if `time` is omitted the current time is used.
 
 if `format` can be 'l' local time or 'u' UTC time, if omitted is defaulted as 'l'(local time).
 
-.. sq:function:: getenv(varaname)
-
-    Returns a string containing the value of the environment variable `varname`
-
 .. sq:function:: time()
 
     returns the number of seconds elapsed since midnight 00:00:00, January 1, 1970.