merge revision(s) 0691994, 51bc992, 42daa6c: [Backport #21141]

	[Bug #21141] [DOC] Clarify what time is in UTC

	[Bug #21141] [DOC] Refine description of `Time#utc?`

	[Bug #21141] [DOC] Fix indentation

Author: nagachika

time.c

@@ -3996,10 +3996,21 @@ time_eql(VALUE time1, VALUE time2)
  *    now = Time.now
  *    # => 2022-08-18 10:24:13.5398485 -0500
  *    now.utc? # => false
+ *    now.getutc.utc? # => true
  *    utc = Time.utc(2000, 1, 1, 20, 15, 1)
  *    # => 2000-01-01 20:15:01 UTC
  *    utc.utc? # => true
  *
+ *  +Time+ objects created with these methods are considered to be in
+ *  UTC:
+ *
+ *  * Time.utc
+ *  * Time#utc
+ *  * Time#getutc
+ *
+ *  Objects created in other ways will not be treated as UTC even if
+ *  the environment variable "TZ" is "UTC".
+ *
  *  Related: Time.utc.
  */
 

version.h

@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 7
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 142
+#define RUBY_PATCHLEVEL 143
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"