[tab:meta.reflection.operators] Fix another operator spelling

Similar to 746811a,
which missed this one.

Author: tkoeppe

source/meta.tex

@@ -3612,7 +3612,7 @@
 \tcode{op_slash_equals}           & \tcode{operator/=}        & \tcode{/=}       \\ \rowsep
 \tcode{op_percent_equals}         & \tcode{operator\%=}       & \tcode{\%=}      \\ \rowsep
 \tcode{op_caret_equals}           & \tcode{operator\caret=}   & \tcode{\caret=}  \\ \rowsep
-\tcode{op_ampersand_equals}       & \tcode{operator\&=}       & \tcode{\&}       \\ \rowsep
+\tcode{op_ampersand_equals}       & \tcode{operator\&=}       & \tcode{\&=}      \\ \rowsep
 \tcode{op_pipe_equals}            & \tcode{operator|=}        & \tcode{|=}       \\ \rowsep
 \tcode{op_equals_equals}          & \tcode{operator==}        & \tcode{==}       \\ \rowsep
 \tcode{op_exclamation_equals}     & \tcode{operator!=}        & \tcode{!=}       \\ \rowsep