Fix markup syntax for code block titles

_source/_posts/2023-10-01-import-lc-records-into-pmb.markdown

@@ -10,7 +10,7 @@ Wanted to import the [Library of Congress record](https://lccn.loc.gov/83020232)
 It failed with an obscure message (*notices invalides*). Looking at the code, this could be caused by a missing title statement (UNIMARC tag `$200a`).
 And indeed upon inspection the title is in MARC zone `$245`:
 
-``` MARC21 record
+```marc
 00953cam a2200253 a 4500
 001 4715262
 005 20140505111109.0
@@ -32,13 +32,14 @@ And indeed upon inspection the title is in MARC zone `$245`:
 991    $b c-GenColl $h PE1625 $i .W34 1984b $t Copy 1 $w BOOKS
 991    $b c-GenColl $h PE1625 $i .W34 1984b $p 00017698631 $t Copy 2 $w CCF
 ```
+{:title="MARC21 record"}
 
 Turns out that the LoC notice is in MARC21 format, whereas PMB expects UNIMARC.
 So I used [MarcEdit](https://marcedit.reeset.net/) to convert MARC21 to UNIMARC and was able to import.
 
 Conversion process: `Tools > UNIMARC Tools > MARC21=>UNIMARC`
 
-``` UNIMARC record
+```marc
 00812  22a22002415  450
 001 4715262
 005 20140505111109.0
@@ -59,3 +60,4 @@ Conversion process: `Tools > UNIMARC Tools > MARC21=>UNIMARC`
 721    $a Guralnik, David B. $f 1920-2000.
 802    $a zz
 ```
+{:title="UNIMARC record"}