Bug 29875: Update wording on maxreserves system preference

To test:
1 - see the current wording
2 - apply patch
3 - words are changed

Test to confirm accuracy of wording:
1 - set maxreserves to 1
2 - set all/all circ rule to unlimited holds allowed total, holds allowed daily, and holds per record
3 - confirm you can place 1 hold for a patron, but the second is blocked
4 - set maxreserves to 0
5 - confirm you can place and number of holds for the patron
6 - set maxreserves to blank
7 - confirm you can place any number of holds for the patron

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit a6e54eea79)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/en/modules/admin/preferences/circulation.pref

@@ -774,10 +774,10 @@ Circulation:
                   0: Automatically
             - mark a hold as found and waiting when a hold is placed on a specific item and that item is already checked in.
         -
-            - Patrons can only have
+            - Patrons can have a maximum of
             - pref: maxreserves
               class: integer
-            - holds at once.
+            - holds at once (leave blank or set to 0 to disable). Additional limits may apply based on circulation rules.
         -
             - pref: emailLibrarianWhenHoldIsPlaced
               choices: