Remove duplicate words in docs and code comments.

Additionally, add a missing "the" in a couple of places.

Author: Vignesh C, Dagfinn Ilmari Mannsåker
Discussion: http://postgr.es/m/CALDaNm28t+wWyPfuyqEaARS810Je=dRFkaPertaLAEJYY2cWYQ@mail.gmail.com

Author: Amit Kapila

.cirrus.star

@@ -46,7 +46,7 @@ def main():
 
 def config_from(config_src):
     """return contents of config file `config_src`, surrounded by markers
-    indicating start / end of the the included file
+    indicating start / end of the included file
     """
 
     config_contents = fs.read(config_src)

contrib/citext/expected/citext_utf8.out

@@ -2,7 +2,7 @@
  * This test must be run in a database with UTF-8 encoding
  * and a Unicode-aware locale.
  *
- * Also disable this file for ICU, because the test for the the
+ * Also disable this file for ICU, because the test for the
  * Turkish dotted I is not correct for many ICU locales. citext always
  * uses the default collation, so it's not easy to restrict the test
  * to the "tr-TR-x-icu" collation where it will succeed.

contrib/citext/expected/citext_utf8_1.out

@@ -2,7 +2,7 @@
  * This test must be run in a database with UTF-8 encoding
  * and a Unicode-aware locale.
  *
- * Also disable this file for ICU, because the test for the the
+ * Also disable this file for ICU, because the test for the
  * Turkish dotted I is not correct for many ICU locales. citext always
  * uses the default collation, so it's not easy to restrict the test
  * to the "tr-TR-x-icu" collation where it will succeed.

contrib/citext/sql/citext_utf8.sql

@@ -2,7 +2,7 @@
  * This test must be run in a database with UTF-8 encoding
  * and a Unicode-aware locale.
  *
- * Also disable this file for ICU, because the test for the the
+ * Also disable this file for ICU, because the test for the
  * Turkish dotted I is not correct for many ICU locales. citext always
  * uses the default collation, so it's not easy to restrict the test
  * to the "tr-TR-x-icu" collation where it will succeed.

doc/src/sgml/logical-replication.sgml

@@ -1788,7 +1788,7 @@ CONTEXT:  processing remote data for replication origin "pg_16395" during "INSER
   </para>
 
   <para>
-   To create a subscription, the user must have the privileges of the
+   To create a subscription, the user must have the privileges of
    the <literal>pg_create_subscription</literal> role, as well as
    <literal>CREATE</literal> privileges on the database.
   </para>

doc/src/sgml/ref/create_subscription.sgml

@@ -51,7 +51,7 @@ CREATE SUBSCRIPTION <replaceable class="parameter">subscription_name</replaceabl
   </para>
 
   <para>
-   To be able to create a subscription, you must have the privileges of the
+   To be able to create a subscription, you must have the privileges of
    the <literal>pg_create_subscription</literal> role, as well as
    <literal>CREATE</literal> privileges on the current database.
   </para>

src/backend/access/nbtree/nbtsearch.c

@@ -1664,7 +1664,7 @@ _bt_readpage(IndexScanDesc scan, ScanDirection dir, OffsetNumber offnum)
 
 			/*
 			 * If the result of prechecking required keys was true, then in
-			 * assert-enabled builds we also recheck that _bt_checkkeys()
+			 * assert-enabled builds we also recheck that the _bt_checkkeys()
 			 * result is the same.
 			 */
 			Assert(!requiredMatchedByPrecheck ||
@@ -1783,7 +1783,7 @@ _bt_readpage(IndexScanDesc scan, ScanDirection dir, OffsetNumber offnum)
 
 			/*
 			 * If the result of prechecking required keys was true, then in
-			 * assert-enabled builds we also recheck that _bt_checkkeys()
+			 * assert-enabled builds we also recheck that the _bt_checkkeys()
 			 * result is the same.
 			 */
 			Assert(!requiredMatchedByPrecheck ||

src/backend/access/transam/xlogreader.c

@@ -846,7 +846,7 @@ XLogDecodeNextRecord(XLogReaderState *state, bool nonblocking)
 
 	/*
 	 * If we got here without a DecodedXLogRecord, it means we needed to
-	 * validate total_len before trusting it, but by now now we've done that.
+	 * validate total_len before trusting it, but by now we've done that.
 	 */
 	if (decoded == NULL)
 	{

src/backend/executor/nodeHashjoin.c

@@ -1306,7 +1306,7 @@ ExecParallelHashJoinNewBatch(HashJoinState *hjstate)
  * The data recorded in the file for each tuple is its hash value,
  * then the tuple in MinimalTuple format.
  *
- * fileptr points to a batch file in one of the the hashtable arrays.
+ * fileptr points to a batch file in one of the hashtable arrays.
  *
  * The batch files (and their buffers) are allocated in the spill context
  * created for the hashtable.

src/test/regress/expected/tuplesort.out

@@ -401,7 +401,7 @@ FETCH NEXT FROM c;
  00000000-0000-0000-0000-000000000000
 (1 row)
 
--- scroll beyond end end
+-- scroll beyond end
 FETCH LAST FROM c;
  noabort_decreasing 
 --------------------
@@ -498,7 +498,7 @@ FETCH NEXT FROM c;
  00000000-0000-0000-0000-000000000000
 (1 row)
 
--- scroll beyond end end
+-- scroll beyond end
 FETCH LAST FROM c;
  noabort_decreasing 
 --------------------