Fix typos.

Reported-by: John Naylor
Author: John Naylor
Backpatch-through: 9.5
Discussion: https://postgr.es/m/CACPNZCtRuvs6G+EYqejhVJgBq2AKeZdXRVJsbX4syhO9gn5SNQ@mail.gmail.com

src/test/regress/input/largeobject.source

@@ -180,7 +180,7 @@ UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS inte
 -- verify length of large object
 SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
 
--- with the default BLKSZ, LOBLKSZ = 2048, so this positions us for a block
+-- with the default BLCKSZ, LOBLKSIZE = 2048, so this positions us for a block
 -- edge case
 SELECT lo_lseek(fd, 2030, 0) FROM lotest_stash_values;
 

src/test/regress/output/largeobject.source

@@ -326,7 +326,7 @@ SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
    670800
 (1 row)
 
--- with the default BLKSZ, LOBLKSZ = 2048, so this positions us for a block
+-- with the default BLCKSZ, LOBLKSIZE = 2048, so this positions us for a block
 -- edge case
 SELECT lo_lseek(fd, 2030, 0) FROM lotest_stash_values;
  lo_lseek 

src/test/regress/output/largeobject_1.source

@@ -326,7 +326,7 @@ SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
    680800
 (1 row)
 
--- with the default BLKSZ, LOBLKSZ = 2048, so this positions us for a block
+-- with the default BLCKSZ, LOBLKSIZE = 2048, so this positions us for a block
 -- edge case
 SELECT lo_lseek(fd, 2030, 0) FROM lotest_stash_values;
  lo_lseek