changelog: proofread some luajit changelogs

NO_DOC=changelog update
NO_TEST=changelog update

changelogs/unreleased/gh-7745-exceptions-on-traces.md

 ## feature/luajit
 
-* Now the LuaJIT can handle exceptions on traces (gh-7745).
+* LuaJIT now can handle exceptions on traces (gh-7745).

changelogs/unreleased/gh-8069-luajit-fixes.md

@@ -8,5 +8,5 @@ were fixed as part of this activity:
 * Fixed `pcall()` call without arguments on arm64.
 * Fixed assembling of IR_{AHUV}LOAD specialized to boolean for aarch64.
 * Fixed constant rematerialization on arm64.
-* Fixed `emit_rma()` for x64/GC64 mode for non-`mov` instructions.
+* Fixed `emit_rma()` for the x64/GC64 mode for non-`mov` instructions.
 * Limited Lua C library path with the default `PATH_MAX` value of 4096 bytes.

changelogs/unreleased/gh-8516-luajit-fixes.md

@@ -3,4 +3,4 @@
 Backported patches from the vanilla LuaJIT trunk (gh-8516). The following issues
 were fixed as part of this activity:
 
-* Fixed assembling of `IR_LREF` assembling for GC64 mode on x86_64
+* Fixed `IR_LREF` assembling for the GC64 mode on x86_64.