Update opts.md

fix whitespace

book/src/opts.md

@@ -22,5 +22,5 @@ Below are known optimizations that we will be implementing in the coming weeks,
 
 - SP1 implements word-addressable memory (the CPU has to read an entire 64-bit word of memory at once). Jolt currently implements byte-addressable memory (the RISC-V CPU is allowed to read one byte at a time, as required by the RISC-V specification). 
 
-Most benchmarks get compiled into RISC-V programs that mostly read entire words at once. Switching to word-addressable memory will improve Jolt’s speed on these benchmarks by 5%. 
+    Most benchmarks get compiled into RISC-V programs that mostly read entire words at once. Switching to word-addressable memory will improve Jolt’s speed on these benchmarks by 5%.