Fix Extensions.rst issue.

Author: rlavaee

llvm/docs/Extensions.rst

@@ -407,11 +407,11 @@ a BB address map table for every function.
 The ``SHT_LLVM_BB_ADDR_MAP`` type provides backward compatibility to allow
 reading older versions of the BB address map generated by older compilers (up to
 two years old). Each function entry starts with a version byte which specifies
-the encoding version to use. This follows by a feature byte which specifies the
-features specific to this particular entry. The function base address is stored
-as a full address. Other addresses in the entry (block begin and end addresses
-and callsite addresses) are stored in a running-offset fashion, as offset
-relative to the prior address.
+the encoding version to use. This is followed by a feature byte which specifies
+the features specific to this particular entry. The function base address is
+stored as a full address. Other addresses in the entry (block begin and end
+addresses and callsite addresses) are stored in a running-offset fashion, as
+offsets relative to prior addresses.
 
 The following versioning schemes are currently supported (newer versions support
 features of the older versions).
@@ -450,6 +450,7 @@ The first range corresponds to the function entry.
 Example:
 
 .. code-block:: gas
+
   .section  ".llvm_bb_addr_map","",@llvm_bb_addr_map
   .byte     2                             # version number
   .byte     8                             # feature byte