Delete hard-coded page number (riscv#1575)

Resolves riscv#1574

src/hypervisor.adoc

@@ -179,7 +179,7 @@ The VSXL field controls the effective XLEN for VS-mode (known as
 VSXLEN), which may differ from the XLEN for HS-mode (HSXLEN). When
 HSXLEN=32, the VSXL field does not exist, and VSXLEN=32. When HSXLEN=64,
 VSXL is a *WARL* field that is encoded the same as the MXL field of `misa`,
-shown in <<misabase>> on page <<misabase, 19>>. In particular, an
+shown in <<misabase>>. In particular, an
 implementation may make VSXL be a read-only field whose value always
 ensures that VSXLEN=HSXLEN.