added new placeholders for biomass and landings figures in captions/a…

…lt text csv

inst/resources/captions_alttext.csv

@@ -1,6 +1,8 @@
 label,type,caption,alt_text
 recruitment,figure,recruitment figure caption here. Starts in start_year.,recruitment alt text here
 spawning_biomass,figure,spawning biomass figure caption here. ,spawning biomass alt text here. The F(end) = Fend
+landings,figure,recruitment figure caption here. Starts in start_year.,landings alt text here
+biomass,figure,biomass fig cap here,biomass alt text here
 recruitment,table,recruitment table caption here,
 spawning_biomass,table,spawning biomass table caption here,
 indices,table,indices table caption here,